Mayan calendar
The ancient Maya people had two somewhat distinct calendar systems.
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You are encouraged to solve this task according to the task description, using any language you may know.
In somewhat simplified terms, one is a cyclical calendar known as The Calendar Round, that meshes several sacred and civil cycles; the other is an offset calendar known as The Long Count, similar in many ways to the Gregorian calendar.
The Calendar Round
The Calendar Round has several intermeshing sacred and civil cycles that uniquely identify a specific date in an approximately 52 year cycle.
The Tzolk’in
The sacred cycle in the Mayan calendar round was called the Tzolk’in. The Tzolk'in has a cycle of 20 day names:
Imix’ Ik’ Ak’bal K’an Chikchan Kimi Manik’ Lamat Muluk Ok Chuwen Eb Ben Hix Men K’ib’ Kaban Etz’nab’ Kawak Ajaw
Intermeshed with the named days, the Tzolk’in has a cycle of 13 numbered days; 1 through 13. Every day has both a number and a name that repeat in a 260 day cycle.
For example:
1 Imix’ 2 Ik’ 3 Ak’bal ... 11 Chuwen 12 Eb 13 Ben 1 Hix 2 Men 3 K’ib’ ... and so on.
The Haab’
The Mayan civil calendar is called the Haab’. This calendar has 365 days per year, and is sometimes called the ‘vague year.’ It is substantially the same as our year, but does not make leap year adjustments, so over long periods of time, gets out of synchronization with the seasons. It consists of 18 months with 20 days each, and the end of the year, a special month of only 5 days, giving a total of 365. The 5 days of the month of Wayeb’ (the last month), are usually considered to be a time of bad luck.
Each month in the Haab’ has a name. The Mayan names for the civil months are:
Pop Wo’ Sip Sotz’ Sek Xul Yaxk’in Mol Ch’en Yax Sak’ Keh Mak K’ank’in Muwan Pax K’ayab Kumk’u Wayeb’ (Short, "unlucky" month)
The months function very much like ours do. That is, for any given month we count through all the days of that month, and then move on to the next month.
Normally, the day 1 Pop is considered the first day of the civil year, just as 1 January is the first day of our year. In 2019, 1 Pop falls on April 2nd. But, because of the leap year in 2020, 1 Pop falls on April 1st in the years 2020-2023.
The only really unusual aspect of the Haab’ calendar is that, although there are 20 (or 5) days in each month, the last day of the month is not called the 20th (5th). Instead, the last day of the month is referred to as the ‘seating,’ or ‘putting in place,’ of the next month. (Much like how in our culture, December 24th is Christmas Eve and December 31st is 'New-Years Eve'.) In the language of the ancient Maya, the word for seating was chum, So you might have:
... 18 Pop (18th day of the first month) 19 Pop (19th day of the first month) Chum Wo’ (20th day of the first month) 1 Wo’ (1st day of the second month) ... and so on.
Dates for any particular day are a combination of the Tzolk’in sacred date, and Haab’ civil date. When put together we get the “Calendar Round.”
Calendar Round dates always have two numbers and two names, and they are always written in the same order:
(1) the day number in the Tzolk’in (2) the day name in the Tzolk’in (3) the day of the month in the Haab’ (4) the month name in the Haab’
A calendar round is a repeating cycle with a period of just short of 52 Gregorian calendar years. To be precise: it is 52 x 365 days. (No leap days)
Lords of the Night
A third cycle of nine days honored the nine Lords of the Night; nine deities that were associated with each day in turn. The names of the nine deities are lost; they are now commonly referred to as G1 through G9. The Lord of the Night may or may not be included in a Mayan date, if it is, it is typically just the appropriate G(x) at the end.
The Long Count
Mayans had a separate independent way of measuring time that did not run in cycles. (At least, not on normal human scales.) Instead, much like our yearly calendar, each day just gets a little further from the starting point. For the ancient Maya, the starting point was the ‘creation date’ of the current world. This date corresponds to our date of August 11, 3114 B.C. Dates are calculated by measuring how many days have transpired since this starting date; This is called “The Long Count.” Rather than just an absolute count of days, the long count is broken up into unit blocks, much like our calendar has months, years, decades and centuries.
The basic unit is a k’in - one day. A 20 day month is a winal. 18 winal (360 days) is a tun - sometimes referred to as a short year. 20 short years (tun) is a k’atun 20 k’atun is a bak’tun
There are longer units too:
Piktun == 20 Bak’tun (8,000 short years) Kalabtun == 20 Piktun (160,000 short years) Kinchiltun == 20 Kalabtun (3,200,000 short years)
For the most part, the Maya only used the blocks of time up to the bak’tun. One bak’tun is around 394 years, much more than a human life span, so that was all they usually needed to describe dates in this era, or this world. It is worth noting, the two calendars working together allow much more accurate and reliable notation for dates than is available in many other calendar systems; mostly due to the pragmatic choice to make the calendar simply track days, rather than trying to make it align with seasons and/or try to conflate it with the notion of time.
Mayan Date correlations
There is some controversy over finding a correlation point between the Gregorian and Mayan calendars. The Gregorian calendar is full of jumps and skips to keep the calendar aligned with the seasons so is much more difficult to work with. The most commonly used correlation factor is The GMT: 584283. Julian 584283 is a day count corresponding Mon, Aug 11, 3114 BCE in the Gregorian calendar, and the final day in the last Mayan long count cycle: 13.0.0.0.0 which is referred to as "the day of creation" in the Mayan calendar. There is nothing in known Mayan writing or history that suggests that a long count "cycle" resets every 13 bak’tun. Judging by their other practices, it would make much more sense for it to reset at 20, if at all.
The reason there was much interest at all, outside historical scholars, in the Mayan calendar is that the long count recently (relatively speaking) rolled over to 13.0.0.0.0 (the same as the historic day of creation Long Count date) on Fri, Dec 21, 2012 (using the most common GMT correlation factor), prompting conspiracy theorists to predict a cataclysmic "end-of-the-world" scenario.
Excerpts taken from, and recommended reading:
- From the website of the Foundation for the Advancement of Meso-America Studies, Inc.
Pitts, Mark. The complete Writing in Maya Glyphs Book 2 – Maya Numbers and the Maya Calendar. 2009. Accessed 2019-01-19.
http://www.famsi.org/research/pitts/MayaGlyphsBook2.pdf
The Task:
Write a reusable routine that takes a Gregorian date and returns the equivalent date in Mayan in the Calendar Round and the Long Count. At a minimum, use the GMT correlation. If desired, support other correlations.
Using the GMT correlation, the following Gregorian and Mayan dates are equivalent:
Dec 21, 2012 (Gregorian) 4 Ajaw 3 K’ank’in G9 (Calendar round) 13.0.0.0.0 (Long count)
Support looking up dates for at least 50 years before and after the Mayan Long Count 13 bak’tun rollover: Dec 21, 2012. (Will require taking into account Gregorian leap days.)
Show the output here, on this page, for at least the following dates:
(Note that these are in ISO-8601 format: YYYY-MM-DD. There is no requirement to use ISO-8601 format in your program, but if you differ, make a note of the expected format.)
2004-06-19 2012-12-18 2012-12-21 2019-01-19 2019-03-27 2020-02-29 2020-03-01
Fortran
<lang Fortran>
PROGRAM MAYA_DRIVER IMPLICIT NONE
! ! Local variables !
CHARACTER(80) :: haab_carry CHARACTER(80) :: long_carry CHARACTER(80) :: nightlord CHARACTER(80) :: tzolkin_carry INTEGER,DIMENSION(8) :: DAY, MONTH, YEAR INTEGER :: INDEX DATA YEAR /2071,2004,2012,2012,2019,2019,2020,2020/ DATA MONTH /5,6,12,12,1,3,2,3/ DATA DAY /16,19,18,21,19,27,29,01/
! 2071-05-16 ! 2004-06-19 ! 2012-12-18 ! 2012-12-21 ! 2019-01-19 ! 2019-03-27 ! 2020-02-29 ! 2020-03-01
DO INDEX = 1,8
!
CALL MAYA_TIME(day(INDEX) , month(INDEX) , year(INDEX) , long_carry , haab_carry , tzolkin_carry , & & nightlord) WRITE(6,20)day(INDEX),month(INDEX),year(INDEX),TRIM(tzolkin_carry),TRIM(haab_carry),TRIM(long_carry),TRIM(nightlord)
20 FORMAT(1X,I0,'-',I0,'-',I0,T12,A,T24,A,T38,A,T58,A)
END DO STOP END PROGRAM MAYA_DRIVER
! ! SUBROUTINE MAYA_TIME
subroutine maya_time(day,month,year, long_carry,haab_carry, tzolkin_carry,nightlord) implicit none integer(kind=4), parameter :: startdate = 584283 ! Start of the Mayan Calendar in Julian days integer(kind=4), parameter :: kin = 1 integer(kind=4), parameter :: winal = 20*kin integer(kind=4), parameter :: tun = winal*18 integer(kind=4), parameter :: katun = tun*20 integer(kind=4), parameter :: baktun = katun*20 integer(kind=4), parameter :: piktun = baktun*20 integer(kind=4), parameter :: longcount = baktun*20
!
character(len=8), dimension(20) ,parameter :: tzolkin = & ["Imix' ", "Ik´ ", "Ak´bal ", "K´an ", "Chikchan", "Kimi ", & "Manik´ ", "Lamat ", "Muluk ", "Ok ", "Chuwen ", "Eb ", & "Ben ", "Hix ", "Men ", "K´ib´ ", "Kaban ", "Etz´nab´", & "Kawak ", "Ajaw "] character(len=8), dimension(19) ,parameter :: haab = & ["Pop ", "Wo´ ", "Sip ", "Sotz´ ", "Sek ", "Xul ", & "Yaxk´in ", "Mol ", "Ch´en ", "Yax ", "Sak´ ", "Keh ", & "Mak ", "K´ank´in", "Muwan ", "Pax ", "K´ayab ", "Kumk´u ", & "Wayeb´ "] character(len=20), dimension(9) ,parameter :: night_lords = & ["(G1) Xiuhtecuhtli ", & ! ("Turquoise/Year/Fire Lord") "(G2) Tezcatlipoca ", & ! ("Smoking Mirror") "(G3) Piltzintecuhtli", & ! ("Prince Lord") "(G4) Centeotl ", & ! ("Maize God") "(G5) Mictlantecuhtli", & ! ("Underworld Lord") "(G6) Chalchiuhtlicue", & ! ("Jade Is Her Skirt") "(G7) Tlazolteotl ", & ! ("Filth God[dess]") "(G8) Tepeyollotl ", & ! ("Mountain Heart") "(G9) Tlaloc " ] ! (Rain God) integer(kind=4) :: day,month,year intent(in) :: day,month,year
!
integer(kind=4) :: j,l, numdays, keptdays integer(kind=4) :: kin_no, winal_no, tun_no, katun_no, baktun_no, longcount_no character(*) :: haab_carry, nightlord, tzolkin_carry, long_carry intent(inout) :: haab_carry, nightlord, tzolkin_carry, long_carry integer :: mo,da
!
keptdays = julday(day,month,year) ! Get the Julian date for selected date numdays = keptdays ! Keep for calcs later
! Adjust from the beginning
numdays = numdays-startdate ! Adjust the number of days from start of Mayan Calendar if (numdays .ge. longcount)then ! We check if we have passed a longcount and need to adjust for a new start longcount_no = numdays/longcount print*, ' We have more than one longcount ',longcount_no endif
! ! Calculate the longdate
baktun_no = numdays/baktun numdays = numdays - (baktun_no*baktun) ! Decrement days down by the number of baktuns katun_no = numdays/katun ! Get number of katuns numdays = numdays - (katun_no*katun) tun_no = numdays/tun numdays = numdays-(tun_no*tun) winal_no = numdays/winal numdays = numdays-(winal_no*winal) kin_no = numdays ! What is left is simply the days long_carry = ' ' ! blank it out write(long_carry,'(4(i2.2,"."),I2.2)') baktun_no,katun_no,tun_no,winal_no,kin_no
! ! OK. Now the longcount is done, let's calculate Tzolk´in, Haab´ & Nightlord (the calendar round) !
haab_carry = " " L = mod((keptdays+65),365) mo = (L/20)+1 da = mod(l,20) if(da.ne.0)then write(haab_carry,'(i2,1x,a)') da,haab(mo) else write(haab_carry,'(a,1x,a)') 'Chum',haab(mo) endif
! ! Ok, Now let's calculate the Tzolk´in ! The calendar starts on the 4 Ahu
tzolkin_carry = " " ! Total blank the carrier mo = mod((keptdays+16),20) + 1 da = mod((keptdays+5),13) + 1 write(tzolkin_carry,'(i2,1x,a)') da,tzolkin(mo)
! ! Now let's have a look at the lords of the night ! There are 9 lords of the night, let's assume that they start on the first day of the year !
numdays = keptdays -startdate ! Elapsed Julian days since start of calendar J = mod(numdays,9) ! Number of days into this cycle if (j.eq.0) j = 9 nightlord = night_lords(j) RETURN contains
!
FUNCTION JULDAY( Id , Mm, Iyyy) IMPLICIT NONE
! ! PARAMETER definitions !
INTEGER , PARAMETER :: IGREG = 15 + 31*(10 + 12*1582)
! ! Dummy arguments !
INTEGER :: Id , Iyyy , Mm INTEGER :: JULDAY INTENT (IN) Id , Iyyy , Mm
! ! Local variables !
INTEGER :: ja , jm , jy
!
jy = Iyyy IF(jy == 0)STOP 'julday: there is no year zero' IF(jy < 0)jy = jy + 1 IF(Mm > 2)THEN jm = Mm + 1 ELSE jy = jy - 1 jm = Mm + 13 END IF JULDAY = 365*jy + INT(0.25D0*jy + 2000.D0) + INT(30.6001D0*jm) + Id + 1718995 IF(Id + 31*(Mm + 12*Iyyy) >= IGREG)THEN ja = INT(0.01D0*jy) JULDAY = JULDAY + 2 - ja + INT(0.25D0*ja) END IF RETURN END FUNCTION JULDAY
END SUBROUTINE maya_time
</lang>
- Output:
16-5-2071 1 Ok 18 Sip 13.02.19.04.10 (G9) Tlaloc 19-6-2004 4 Ben 16 Sotz´ 12.19.11.06.13 (G7) Tlazolteotl 18-12-2012 1 Kaban Chum K´ank´in 12.19.19.17.17 (G6) Chalchiuhtlicue 21-12-2012 4 Ajaw 3 K´ank´in 13.00.00.00.00 (G9) Tlaloc 19-1-2019 1 Ajaw 13 Muwan 13.00.06.03.00 (G6) Chalchiuhtlicue 27-3-2019 3 Manik´ Chum Wayeb´ 13.00.06.06.07 (G1) Xiuhtecuhtli 29-2-2020 4 Kimi 14 K´ayab 13.00.07.05.06 (G7) Tlazolteotl 1-3-2020 5 Manik´ 15 K´ayab 13.00.07.05.07 (G8) Tepeyollotl
Go
<lang go>package main
import (
"fmt" "strconv" "strings" "time"
)
var sacred = strings.Fields("Imix’ Ik’ Ak’bal K’an Chikchan Kimi Manik’ Lamat Muluk Ok Chuwen Eb Ben Hix Men K’ib’ Kaban Etz’nab’ Kawak Ajaw")
var civil = strings.Fields("Pop Wo’ Sip Sotz’ Sek Xul Yaxk’in Mol Ch’en Yax Sak’ Keh Mak K’ank’in Muwan’ Pax K’ayab Kumk’u Wayeb’")
var (
date1 = time.Date(2012, time.December, 21, 0, 0, 0, 0, time.UTC) date2 = time.Date(2019, time.April, 2, 0, 0, 0, 0, time.UTC)
)
func tzolkin(date time.Time) (int, string) {
diff := int(date.Sub(date1).Hours()) / 24 rem := diff % 13 if rem < 0 { rem = 13 + rem } var num int if rem <= 9 { num = rem + 4 } else { num = rem - 9 } rem = diff % 20 if rem <= 0 { rem = 20 + rem } return num, sacred[rem-1]
}
func haab(date time.Time) (string, string) {
diff := int(date.Sub(date2).Hours()) / 24 rem := diff % 365 if rem < 0 { rem = 365 + rem } month := civil[(rem+1)/20] last := 20 if month == "Wayeb’" { last = 5 } d := rem%20 + 1 if d < last { return strconv.Itoa(d), month } return "Chum", month
}
func longCount(date time.Time) string {
diff := int(date.Sub(date1).Hours()) / 24 diff += 13 * 400 * 360 baktun := diff / (400 * 360) diff %= 400 * 360 katun := diff / (20 * 360) diff %= 20 * 360 tun := diff / 360 diff %= 360 winal := diff / 20 kin := diff % 20 return fmt.Sprintf("%d.%d.%d.%d.%d", baktun, katun, tun, winal, kin)
}
func lord(date time.Time) string {
diff := int(date.Sub(date1).Hours()) / 24 rem := diff % 9 if rem <= 0 { rem = 9 + rem } return fmt.Sprintf("G%d", rem)
}
func main() {
const shortForm = "2006-01-02" dates := []string{ "2004-06-19", "2012-12-18", "2012-12-21", "2019-01-19", "2019-03-27", "2020-02-29", "2020-03-01", "2071-05-16", } fmt.Println(" Gregorian Tzolk’in Haab’ Long Lord of") fmt.Println(" Date # Name Day Month Count the Night") fmt.Println("---------- -------- ------------- -------------- ---------") for _, dt := range dates { date, _ := time.Parse(shortForm, dt) n, s := tzolkin(date) d, m := haab(date) lc := longCount(date) l := lord(date) fmt.Printf("%s %2d %-8s %4s %-9s %-14s %s\n", dt, n, s, d, m, lc, l) }
}</lang>
- Output:
Gregorian Tzolk’in Haab’ Long Lord of Date # Name Day Month Count the Night ---------- -------- ------------- -------------- --------- 2004-06-19 4 Ben 16 Sotz’ 12.19.11.6.13 G7 2012-12-18 1 Kaban Chum K’ank’in 12.19.19.17.17 G6 2012-12-21 4 Ajaw 3 K’ank’in 13.0.0.0.0 G9 2019-01-19 1 Ajaw 13 Muwan’ 13.0.6.3.0 G6 2019-03-27 3 Manik’ Chum Wayeb’ 13.0.6.6.7 G1 2020-02-29 4 Kimi 14 K’ayab 13.0.7.5.6 G7 2020-03-01 5 Manik’ 15 K’ayab 13.0.7.5.7 G8 2071-05-16 1 Ok 18 Sip 13.2.19.4.10 G9
Julia
<lang julia>using Dates
const Tzolk´in = [ "Imix´", "Ik´", "Ak´bal", "K´an", "Chikchan", "Kimi", "Manik´", "Lamat", "Muluk", "Ok", "Chuwen", "Eb", "Ben", "Hix", "Men", "K´ib´", "Kaban", "Etz´nab´", "Kawak", "Ajaw" ] const Haab´ = [ "Pop", "Wo´", "Sip", "Sotz´", "Sek", "Xul", "Yaxk´in", "Mol", "Ch´en", "Yax", "Sak´", "Keh", "Mak", "K´ank´in", "Muwan", "Pax", "K´ayab", "Kumk´u", "Wayeb´" ] const creationTzolk´in = Date(2012, 12, 21) const zeroHaab´ = Date(2019, 4, 2) daysperMayanmonth(month) = (month == "Wayeb´" ? 5 : 20)
function tzolkin(gregorian::Date)
deltadays = (gregorian - creationTzolk´in).value rem = mod1(deltadays, 13) return string(rem <= 9 ? rem + 4 : rem - 9) * " " * Tzolk´in[mod1(deltadays, 20)]
end
function haab(gregorian::Date)
rem = mod1((gregorian - zeroHaab´).value, 365) month = Haab´[(rem + 21) ÷ 20] dayofmonth = rem % 20 + 1 return dayofmonth < daysperMayanmonth(month) ? "$dayofmonth $month" : "Chum $month"
end
function tolongdate(gregorian::Date)
delta = (gregorian - creationTzolk´in).value + 13 * 360 * 400 baktun = delta ÷ (360 * 400) delta %= (400 * 360) katun = delta ÷ (20 * 360) delta %= (20 * 360) tun = delta ÷ 360 delta %= 360 winal, kin = divrem(delta, 20) return mapreduce(x -> lpad(x, 3), *, [baktun, katun, tun, winal, kin])
end
nightlord(gregorian::Date) = "G$(mod1((gregorian - creationTzolk´in).value, 9))"
testdates = [ Date(1963, 11, 21), Date(2004, 06, 19), Date(2012, 12, 18), Date(2012, 12, 21), Date(2019, 01, 19), Date(2019, 03, 27), Date(2020, 02, 29), Date(2020, 03, 01), Date(2071, 5, 16), Date(2020, 2, 2) ]
println("Gregorian Long Count Tzolk´in Haab´ Nightlord") println("-----------------------------------------------------------------") for date in testdates
println(rpad(date,14), rpad(tolongdate(date), 18), rpad(tzolkin(date), 10), rpad(haab(date), 15), nightlord(date))
end
</lang>
- Output:
Gregorian Long Count Tzolk´in Haab´ Nightlord ----------------------------------------------------------------- 1963-11-21 12 17 10 3 12 3 Eb Chum Keh G9 2004-06-19 12 19 11 6 13 4 Ben 16 Sotz´ G7 2012-12-18 12 19 19 17 17 1 Kaban Chum K´ank´in G6 2012-12-21 13 0 0 0 0 4 Ajaw 3 K´ank´in G9 2019-01-19 13 0 6 3 0 1 Ajaw 13 Muwan G6 2019-03-27 13 0 6 6 7 3 Manik´ Chum Wayeb´ G1 2020-02-29 13 0 7 5 6 4 Kimi 14 K´ayab G7 2020-03-01 13 0 7 5 7 5 Manik´ 15 K´ayab G8 2071-05-16 13 2 19 4 10 1 Ok 18 Sip G9 2020-02-02 13 0 7 3 19 3 Kawak 7 Pax G7
Mathematica /Wolfram Language
<lang Mathematica>sacred = {"Imix\[CloseCurlyQuote]", "Ik\[CloseCurlyQuote]",
"Ak\[CloseCurlyQuote]bal", "K\[CloseCurlyQuote]an", "Chikchan", "Kimi", "Manik\[CloseCurlyQuote]", "Lamat", "Muluk", "Ok", "Chuwen", "Eb", "Ben", "Hix", "Men", "K\[CloseCurlyQuote]ib\[CloseCurlyQuote]", "Kaban", "Etz\[CloseCurlyQuote]nab\[CloseCurlyQuote]", "Kawak", "Ajaw"};
civil = {"Pop", "Wo\[CloseCurlyQuote]", "Sip",
"Sotz\[CloseCurlyQuote]", "Sek", "Xul", "Yaxk\[CloseCurlyQuote]in", "Mol", "Ch\[CloseCurlyQuote]en", "Yax", "Sak\[CloseCurlyQuote]", "Keh", "Mak", "K\[CloseCurlyQuote]ank\[CloseCurlyQuote]in", "Muwan\[CloseCurlyQuote]", "Pax", "K\[CloseCurlyQuote]ayab", "Kumk\[CloseCurlyQuote]u", "Wayeb\[CloseCurlyQuote]"};
date1 = {2012, 12, 21, 0, 0, 0}; date2 = {2019, 4, 2, 0, 0, 0};
ClearAll[Tzolkin] Tzolkin[date_] := Module[{diff, rem, num},
diff = QuantityMagnitude[DateDifference[date1, date], "Days"]; rem = Mod[diff, 13]; If[rem <= 9, num = rem + 4 , num = rem - 9 ]; rem = Mod[diff, 20, 1]; ToString[num] <> " " <> sacredrem ]
ClearAll[Haab] Haab[date_] := Module[{diff, rem, month, last, d},
diff = QuantityMagnitude[DateDifference[date2, date], "Days"]; rem = Mod[diff, 365]; month = civil[[Floor[(rem + 1)/20] + 1]]; last = 20; If[month == Last[civil], last = 5 ]; d = Mod[rem, 20] + 1; If[d < last, ToString[d] <> " " <> month , "Chum " <> month ] ]
ClearAll[LongCount] LongCount[date_] := Module[{diff, baktun, katun, tun, winal, kin},
diff = QuantityMagnitude[DateDifference[date1, date], "Days"]; diff += 13 400 360; {baktun, diff} = QuotientRemainder[diff, 400 360]; {katun, diff} = QuotientRemainder[diff, 20 360]; {tun, diff} = QuotientRemainder[diff, 360]; {winal, kin} = QuotientRemainder[diff, 20]; StringRiffle[ToString /@ {baktun, katun, tun, winal, kin}, "."] ]
ClearAll[LordOfTheNight] LordOfTheNight[date_] := Module[{diff, rem},
diff = QuantityMagnitude[DateDifference[date1, date], "Days"]; rem = Mod[diff, 9, 1]; "G" <> ToString[rem] ]
data = {{2004, 06, 19}, {2012, 12, 18}, {2012, 12, 21}, {2019, 01,
19}, {2019, 03, 27}, {2020, 02, 29}, {2020, 03, 01}, {2071, 05, 16}};
tzolkindata = Tzolkin /@ data; haabdata = Haab /@ data; longcountdata = LongCount /@ data; lotndata = LordOfTheNight /@ data; {DateObject /@ data, tzolkindata, haabdata, longcountdata, lotndata} // Transpose // Grid</lang>
- Output:
Sat 19 Jun 2004 4 Ben 16 Sotz' 12.19.11.6.13 G7 Tue 18 Dec 2012 1 Kaban Chum K'ank'in 12.19.19.17.17 G6 Fri 21 Dec 2012 4 Ajaw 3 K'ank'in 13.0.0.0.0 G9 Sat 19 Jan 2019 1 Ajaw 13 Muwan' 13.0.6.3.0 G6 Wed 27 Mar 2019 3 Manik' Chum Wayeb' 13.0.6.6.7 G1 Sat 29 Feb 2020 4 Kimi 14 K'ayab 13.0.7.5.6 G7 Sun 1 Mar 2020 5 Manik' 15 K'ayab 13.0.7.5.7 G8 Sat 16 May 2071 1 Ok 18 Sip 13.2.19.4.10 G9
Nim
<lang Nim>import math, strformat, times
const
Tzolk´in = ["Imix´", "Ik´", "Ak´bal", "K´an", "Chikchan", "Kimi", "Manik´", "Lamat", "Muluk", "Ok", "Chuwen", "Eb", "Ben", "Hix", "Men", "K´ib´", "Kaban", "Etz´nab´", "Kawak", "Ajaw"]
Haab´ = ["Pop", "Wo´", "Sip", "Sotz´", "Sek", "Xul", "Yaxk´in", "Mol", "Ch´en", "Yax", "Sak´", "Keh", "Mak", "K´ank´in", "Muwan", "Pax", "K´ayab", "Kumk´u", "Wayeb´"]
let
creationTzolk´in = initDateTime(21, mDec, 2012, 0, 0, 0, utc()) zeroHaab´ = initDateTime(2, mApr, 2019, 0, 0, 0, utc())
func daysPerMayanMonth(month: string): int =
if month == "Wayeb´": 5 else: 20
proc tzolkin(gregorian: DateTime): string =
let deltaDays = (gregorian - creationTzolk´in).inDays let rem = floorMod(deltaDays, 13) result = $(if rem <= 9: rem + 4 else: rem - 9) & ' ' & Tzolk´in[floorMod(deltaDays - 1, 20)]
proc haab(gregorian: DateTime): string =
let rem = floorMod((gregorian - zeroHaab´).inDays, 365) let month = Haab´[(rem + 1) div 20] let dayOfMonth = rem mod 20 + 1 result = if dayOfMonth < daysPerMayanMonth(month): &"{dayOfMonth} {month}" else: &"Chum {month}"
proc toLongDate(gregorian: DateTime): string =
var delta = (gregorian - creationTzolk´in).inDays + 13 * 360 * 400 var baktun = delta div (360 * 400) delta = delta mod (400 * 360) let katun = delta div (20 * 360) delta = delta mod (20 * 360) let tun = delta div 360 delta = delta mod 360 let winal = delta div 20 let kin = delta mod 20 result = &"{baktun:2} {katun:2} {tun:2} {winal:2} {kin:2}"
proc nightLord(gregorian: DateTime): string =
var rem = (gregorian - creationTzolk´in).inDays mod 9 if rem <= 0: rem += 9 result = 'G' & $rem
when isMainModule:
let testDates = [initDateTime(21, mNov, 1963, 0, 0, 0, utc()), initDateTime(19, mJun, 2004, 0, 0, 0, utc()), initDateTime(18, mDec, 2012, 0, 0, 0, utc()), initDateTime(21, mDec, 2012, 0, 0, 0, utc()), initDateTime(19, mJan, 2019, 0, 0, 0, utc()), initDateTime(27, mMar, 2019, 0, 0, 0, utc()), initDateTime(29, mFeb, 2020, 0, 0, 0, utc()), initDateTime(01, mMar, 2020, 0, 0, 0, utc()), initDateTime(16, mMay, 2071, 0, 0, 0, utc()), initDateTime(02, mfeb, 2020, 0, 0, 0, utc())]
echo "Gregorian Long Count Tzolk´in Haab´ Nightlord" echo "———————————————————————————————————————————————————————————————" for date in testDates:
let dateStr = date.format("YYYY-MM-dd") echo &"{dateStr:14} {date.toLongDate:16} {tzolkin(date):9} {haab(date):14} {nightLord(date)}"</lang>
- Output:
Gregorian Long Count Tzolk´in Haab´ Nightlord ——————————————————————————————————————————————————————————————— 1963-11-21 12 17 10 3 12 3 Eb Chum Keh G9 2004-06-19 12 19 11 6 13 4 Ben 16 Sotz´ G7 2012-12-18 12 19 19 17 17 1 Kaban Chum K´ank´in G6 2012-12-21 13 0 0 0 0 4 Ajaw 3 K´ank´in G9 2019-01-19 13 0 6 3 0 1 Ajaw 13 Muwan G6 2019-03-27 13 0 6 6 7 3 Manik´ Chum Wayeb´ G1 2020-02-29 13 0 7 5 6 4 Kimi 14 K´ayab G7 2020-03-01 13 0 7 5 7 5 Manik´ 15 K´ayab G8 2071-05-16 13 2 19 4 10 1 Ok 18 Sip G9 2020-02-02 13 0 7 3 19 3 Kawak 7 Pax G7
Perl
The module Math::BaseArith
provides mixed-radix conversion via the encode
routine (named as in APL).
<lang perl>use strict; use warnings; use utf8; binmode STDOUT, ":utf8"; use Math::BaseArith; use Date::Calc 'Delta_Days';
my @sacred = qw<Imix’ Ik’ Ak’bal K’an Chikchan Kimi Manik’ Lamat Muluk Ok
Chuwen Eb Ben Hix Men K’ib’ Kaban Etz’nab’ Kawak Ajaw>;
my @civil = qw<Pop Wo’ Sip Sotz’ Sek Xul Yaxk’in Mol Ch’en Yax Sak’ Keh
Mak K’ank’in Muwan’ Pax K’ayab Kumk’u Wayeb’>;
my %correlation = (
'gregorian' => '2012-12-21', 'round' => [3,19,263,8], 'long' => 1872000,
);
sub mayan_calendar_round {
my $date = shift; tzolkin($date), haab($date);
}
sub offset {
my $date = shift; Delta_Days( split('-', $correlation{'gregorian'}), split('-', $date) );
}
sub haab {
my $date = shift; my $index = ($correlation{'round'}[2] + offset $date) % 365; my ($day, $month); if ($index > 360) { $day = $index - 360; $month = $civil[18]; if ($day == 5) { $day = 'Chum'; $month = $civil[0]; } } else { $day = $index % 20; $month = $civil[int $index / 20]; if ($day == 0) { $day = 'Chum'; $month = $civil[int (1 + $index) / 20]; } } $day, $month
}
sub tzolkin {
my $date = shift; my $offset = offset $date; 1 + ($offset + $correlation{'round'}[0]) % 13, $sacred[($offset + $correlation{'round'}[1]) % 20]
}
sub lord {
my $date = shift; 1 + ($correlation{'round'}[3] + offset $date) % 9
}
sub mayan_long_count {
my $date = shift; my $days = $correlation{'long'} + offset $date; encode($days, [20,20,20,18,20]);
}
print <<'EOH';
Gregorian Tzolk’in Haab’ Long Lord of Date # Name Day Month Count the Night
EOH
for my $date (<1961-10-06 2004-06-19 2012-12-18 2012-12-21 2019-01-19 2019-03-27 2020-02-29 2020-03-01 2071-05-16>) {
printf "%10s %2s %-9s %4s %-10s %-14s G%d\n", $date, mayan_calendar_round($date), join('.',mayan_long_count($date)), lord($date);
}</lang>
- Output:
Gregorian Tzolk’in Haab’ Long Lord of Date # Name Day Month Count the Night ----------------------------------------------------------------------- 1961-10-06 7 K’ib’ 14 Ch’en 12.17.8.0.16 G7 2004-06-19 4 Ben 16 Sotz’ 12.19.11.6.13 G7 2012-12-18 1 Kaban Chum K’ank’in 12.19.19.17.17 G6 2012-12-21 4 Ajaw 3 K’ank’in 13.0.0.0.0 G9 2019-01-19 1 Ajaw 13 Muwan’ 13.0.6.3.0 G6 2019-03-27 3 Manik’ Chum Wayeb’ 13.0.6.6.7 G1 2020-02-29 4 Kimi 14 K’ayab 13.0.7.5.6 G7 2020-03-01 5 Manik’ 15 K’ayab 13.0.7.5.7 G8 2071-05-16 1 Ok 18 Sip 13.2.19.4.10 G9
Phix
with javascript_semantics include timedate.e sequence sacred = split("Imix' Ik' Ak'bal K'an Chikchan Kimi Manik' Lamat Muluk Ok Chuwen Eb Ben Hix Men K'ib' Kaban Etz'nab' Kawak Ajaw"), civil = split("Pop Wo' Sip Sotz' Sek Xul Yaxk'in Mol Ch'en Yax Sak' Keh Mak K'ank'in Muwan' Pax K'ayab Kumk'u Wayeb'"), date1 = parse_date_string("21/12/2012",{"DD/MM/YYYY"}), date2 = parse_date_string("2/4/2019",{"DD/MM/YYYY"}) function tzolkin(integer diff) integer rem = mod(diff,13) if rem<0 then rem += 13 end if integer num = iff(rem<=9?rem+4:rem-9) rem = mod(diff,20) if rem<=0 then rem += 20 end if return {num, sacred[rem]} end function function haab(integer diff) integer rem = mod(diff,365) if rem<0 then rem += 365 end if string month = civil[floor((rem+1)/20)+1] integer last = iff(month="Wayeb'"?5:20), d = mod(rem,20) + 1 return {iff(d<last?sprintf("%d",d):"Chum"), month} end function function longCount(integer diff) diff += 13 * 400 * 360 integer baktun := floor(diff/(400*360)) diff = mod(diff,400*360) integer katun := floor(diff/(20*360)) diff = mod(diff,20*360) integer tun = floor(diff/360) diff = mod(diff,360) integer winal = floor(diff/20), kin = mod(diff,20) return sprintf("%d.%d.%d.%d.%d", {baktun, katun, tun, winal, kin}) end function function lord(integer diff) integer rem = mod(diff,9) if rem<=0 then rem += 9 end if return sprintf("G%d", rem) end function constant dates = {"1961-10-06", "1963-11-21", "2004-06-19", "2012-12-18", "2012-12-21", "2019-01-19", "2019-03-27", "2020-02-29", "2020-03-01", "2071-05-16", }, headers = """ Gregorian Tzolk'in Haab' Long Lord of Date # Name Day Month Count the Night ---------- -------- ------------- -------------- --------- """ procedure main() printf(1,headers) for i=1 to length(dates) do string dt = dates[i] timedate td = parse_date_string(dt,{"YYYY-MM-DD"}) integer diff1 = floor(timedate_diff(date1,td,DT_DAY) / (24*60*60)), diff2 = floor(timedate_diff(date2,td,DT_DAY) / (24*60*60)) {integer n, string s} = tzolkin(diff1) string {d, m} = haab(diff2), lc := longCount(diff1), l := lord(diff1) printf(1,"%s %2d %-8s %4s %-9s %-14s %s\n", {dt, n, s, d, m, lc, l}) end for end procedure main()
- Output:
Gregorian Tzolk'in Haab' Long Lord of Date # Name Day Month Count the Night ---------- -------- ------------- -------------- --------- 1961-10-06 7 K'ib' 14 Ch'en 12.17.8.0.16 G7 1963-11-21 3 Eb Chum Keh 12.17.10.3.12 G9 2004-06-19 4 Ben 16 Sotz' 12.19.11.6.13 G7 2012-12-18 1 Kaban Chum K'ank'in 12.19.19.17.17 G6 2012-12-21 4 Ajaw 3 K'ank'in 13.0.0.0.0 G9 2019-01-19 1 Ajaw 13 Muwan' 13.0.6.3.0 G6 2019-03-27 3 Manik' Chum Wayeb' 13.0.6.6.7 G1 2020-02-29 4 Kimi 14 K'ayab 13.0.7.5.6 G7 2020-03-01 5 Manik' 15 K'ayab 13.0.7.5.7 G8 2071-05-16 1 Ok 18 Sip 13.2.19.4.10 G9
Raku
(formerly Perl 6)
<lang perl6>my @sacred = <Imix’ Ik’ Ak’bal K’an Chikchan Kimi Manik’ Lamat Muluk Ok
Chuwen Eb Ben Hix Men K’ib’ Kaban Etz’nab’ Kawak Ajaw>;
my @civil = <Pop Wo’ Sip Sotz’ Sek Xul Yaxk’in Mol Ch’en Yax Sak’ Keh
Mak K’ank’in Muwan’ Pax K’ayab Kumk’u Wayeb’>;
my %correlation = :GMT({
:gregorian(Date.new('2012-12-21')), :round([3,19,263,8]), :long(1872000)
});
sub mayan-calendar-round ($date) { .&tzolkin, .&haab given $date }
sub offset ($date, $factor = 'GMT') { Date.new($date) - %correlation{$factor}<gregorian> }
sub haab ($date, $factor = 'GMT') {
my $index = (%correlation{$factor}<round>[2] + offset $date) % 365; my ($day, $month); if $index > 360 { $day = $index - 360; $month = @civil[18]; if $day == 5 { $day = 'Chum'; $month = @civil[0]; } } else { $day = $index % 20; $month = @civil[$index div 20]; if $day == 0 { $day = 'Chum'; $month = @civil[(1 + $index) div 20]; } } $day, $month
}
sub tzolkin ($date, $factor = 'GMT') {
my $offset = offset $date; 1 + ($offset + %correlation{$factor}<round>[0]) % 13, @sacred[($offset + %correlation{$factor}<round>[1]) % 20]
}
sub lord ($date, $factor = 'GMT') {
'G' ~ 1 + (%correlation{$factor}<round>[3] + offset $date) % 9
}
sub mayan-long-count ($date, $factor = 'GMT') {
my $days = %correlation{$factor}<long> + offset $date; reverse $days.polymod(20,18,20,20);
}
- HEADER
say ' Gregorian Tzolk’in Haab’ Long Lord of '; say ' Date # Name Day Month Count the Night'; say '-----------------------------------------------------------------------';
- DATES
< 1963-11-21 2004-06-19 2012-12-18 2012-12-21 2019-01-19 2019-03-27 2020-02-29 2020-03-01 2071-05-16 >.map: -> $date {
printf "%10s %2s %-9s %4s %-10s %-14s %6s\n", Date.new($date), flat mayan-calendar-round($date), mayan-long-count($date).join('.'), lord($date);
}</lang>
- Output:
Gregorian Tzolk’in Haab’ Long Lord of Date # Name Day Month Count the Night ----------------------------------------------------------------------- 1963-11-21 3 Eb Chum Keh 12.17.10.3.12 G9 2004-06-19 4 Ben 16 Sotz’ 12.19.11.6.13 G7 2012-12-18 1 Kaban Chum K’ank’in 12.19.19.17.17 G6 2012-12-21 4 Ajaw 3 K’ank’in 13.0.0.0.0 G9 2019-01-19 1 Ajaw 13 Muwan’ 13.0.6.3.0 G6 2019-03-27 3 Manik’ Chum Wayeb’ 13.0.6.6.7 G1 2020-02-29 4 Kimi 14 K’ayab 13.0.7.5.6 G7 2020-03-01 5 Manik’ 15 K’ayab 13.0.7.5.7 G8 2071-05-16 1 Ok 18 Sip 13.2.19.4.10 G9
Wren
<lang ecmascript>import "/date" for Date import "/fmt" for Fmt
var sacred = "Imix’ Ik’ Ak’bal K’an Chikchan Kimi Manik’ Lamat Muluk Ok Chuwen Eb Ben Hix Men K’ib’ Kaban Etz’nab’ Kawak Ajaw".split(" ")
var civil = "Pop Wo’ Sip Sotz’ Sek Xul Yaxk’in Mol Ch’en Yax Sak’ Keh Mak K’ank’in Muwan’ Pax K’ayab Kumk’u Wayeb’".split(" ")
var date1 = Date.new(2012, 12, 21) var date2 = Date.new(2019, 4, 2)
var tzolkin = Fn.new { |date|
var diff = (date - date1).days var rem = diff % 13 if (rem < 0) rem = 13 + rem var num = (rem <= 9) ? rem + 4 : rem - 9 rem = diff % 20 if (rem <= 0) rem = 20 + rem return [num, sacred[rem-1]]
}
var haab = Fn.new { |date|
var diff = (date - date2).days var rem = diff % 365 if (rem < 0) rem = 365 + rem var month = civil[((rem+1)/20).floor] var last = (month == "Wayeb'") ? 5 : 20 var d = rem%20 + 1 if (d < last) return [d.toString, month] return ["Chum", month]
}
var longCount = Fn.new { |date|
var diff = (date - date1).days diff = diff + 13*400*360 var baktun = (diff/(400*360)).floor diff = diff % (400*360) var katun = (diff/(20 * 360)).floor diff = diff % (20*360) var tun = (diff/360).floor diff = diff % 360 var winal = (diff/20).floor var kin = diff % 20 return Fmt.swrite("$d.$d.$d.$d.$d", baktun, katun, tun, winal, kin)
}
var lord = Fn.new { |date|
var diff = (date - date1).days var rem = diff % 9 if (rem <= 0) rem = 9 + rem return Fmt.swrite("G$d", rem)
}
var dates = [
"1961-10-06", "1963-11-21", "2004-06-19", "2012-12-18", "2012-12-21", "2019-01-19", "2019-03-27", "2020-02-29", "2020-03-01", "2071-05-16"
] System.print(" Gregorian Tzolk’in Haab’ Long Lord of") System.print(" Date # Name Day Month Count the Night") System.print("---------- -------- ------------- -------------- ---------") Date.default = Date.isoDate for (dt in dates) {
var date = Date.parse(dt) var ns = tzolkin.call(date) var n = ns[0] var s = ns[1] var dm = haab.call(date) var d = dm[0] var m = dm[1] var lc = longCount.call(date) var l = lord.call(date) Fmt.lprint("$s $2d $-8s $4s $-9s $-14s $s", [dt, n, s, d, m, lc, l])
}</lang>
- Output:
Gregorian Tzolk’in Haab’ Long Lord of Date # Name Day Month Count the Night ---------- -------- ------------- -------------- --------- 1961-10-06 7 K’ib’ 14 Ch’en 12.17.8.0.16 G7 1963-11-21 3 Eb Chum Keh 12.17.10.3.12 G9 2004-06-19 4 Ben 16 Sotz’ 12.19.11.6.13 G7 2012-12-18 1 Kaban Chum K’ank’in 12.19.19.17.17 G6 2012-12-21 4 Ajaw 3 K’ank’in 13.0.0.0.0 G9 2019-01-19 1 Ajaw 13 Muwan’ 13.0.6.3.0 G6 2019-03-27 3 Manik’ Chum Wayeb’ 13.0.6.6.7 G1 2020-02-29 4 Kimi 14 K’ayab 13.0.7.5.6 G7 2020-03-01 5 Manik’ 15 K’ayab 13.0.7.5.7 G8 2071-05-16 1 Ok 18 Sip 13.2.19.4.10 G9
zkl
<lang zkl>var [const]
sacred=T("Imix'","Ik'","Ak'bal","K'an","Chikchan","Kimi","Manik'","Lamat","Muluk","Ok", "Chuwen","Eb","Ben","Hix","Men","K'ib'","Kaban","Etz'nab'","Kawak","Ajaw"), civil=T("Pop","Wo'","Sip","Sotz'","Sek","Xul","Yaxk'in","Mol","Ch'en","Yax","Sak'","Keh", "Mak","K'ank'in","Muwan'","Pax","K'ayab","Kumk'u","Wayeb'"), Date=Time.Date, // correlation dates: Creation=T(2012, Date.December, 21), // 13.0.0.0.0, Mayan day of creation OnePop=T(2019, Date.April, 2), // 1 Pop in 2019
fcn haab(date){ // (y,m,d)-->("Chum"|Int,month name)
diff:=Date.deltaDays(OnePop,date.xplode()); //--> signed int rem:=diff%365; if(rem<0) rem=365 + rem; month,last := civil[(rem+1)/20], 20; if(month==civil[-1]) last=5; d:=rem%20 + 1; if(d<last) return(d, month); return("Chum",month);
}
fcn tzolkin(date){ // (y,m,d)-->(Int,String)
diff:=Date.deltaDays(Creation,date.xplode()); //--> signed int rem:=diff % 13; if(rem<0) rem=13 + rem;
num:=( if(rem<=9) rem + 4 else rem - 9 ); rem=diff % 20; if(rem<=0) rem=20 + rem; return(num, sacred[rem-1]);
}
fcn longCount(date){ // (y,m,d) --> (5 Ints)
diff:=Date.deltaDays(Creation,date.xplode()); //--> signed int diff,baktun := diff + 13*400*360, diff/(400*360); diff,katun := diff % (400*360), diff/(20*360); diff,tun := diff % (20*360), diff/360; diff,winal,kin := diff%360, diff/20, diff % 20;
return(baktun, katun, tun, winal, kin)
}
fcn lord(date){ // (y,m,d) --> String
diff:=Date.deltaDays(Creation,date.xplode()); //--> signed int rem:=diff % 9; if(rem<=0) rem=9 + rem; "G%d".fmt(rem)
}</lang> <lang zkl>println(" Gregorian Tzolk'in Haab' Long Lord of"); println(" Date # Name Day Month Count the Night"); println("---------- -------- ------------- -------------- ---------");
- <<<
" 1963-11-21 2004-06-19 2012-12-18 2012-12-21 2019-01-19 2019-03-27 2020-02-29 2020-03-01 2071-05-16 ".split()
- <<<
.pump(Void,fcn(date){
ymd:=Date.parseDate(date); println("%10s %2s %-9s %4s %-10s %-14s %6s".fmt(date, tzolkin(ymd).xplode(), haab(ymd).xplode(), longCount(ymd).concat("."), lord(ymd)));
});</lang>
- Output:
Gregorian Tzolk'in Haab' Long Lord of Date # Name Day Month Count the Night ---------- -------- ------------- -------------- --------- 1963-11-21 3 Eb Chum Keh 12.17.10.3.12 G9 2004-06-19 4 Ben 16 Sotz' 12.19.11.6.13 G7 2012-12-18 1 Kaban Chum K'ank'in 12.19.19.17.17 G6 2012-12-21 4 Ajaw 3 K'ank'in 13.0.0.0.0 G9 2019-01-19 1 Ajaw 13 Muwan' 13.0.6.3.0 G6 2019-03-27 3 Manik' Chum Wayeb' 13.0.6.6.7 G1 2020-02-29 4 Kimi 14 K'ayab 13.0.7.5.6 G7 2020-03-01 5 Manik' 15 K'ayab 13.0.7.5.7 G8 2071-05-16 1 Ok 18 Sip 13.2.19.4.10 G9