Calendar: Difference between revisions
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Unlike IBM 3278 terminals, WYLBUR was "of the time" of 1969. And rather than being a simulation of its display in 20-column mode, the "output" below is an adaptation of the actual display (as simple to create & use in any other text editor not using proportional spacing) for html. This entry is intended to show that WYLBUR could display 1969's calendar in a much smaller area than traditional alternatives (even without ORVYL). It also accomodates the display of Julian and even Old Style Calendars. One has to calculate the day for one Key Date in a given Calendar year, but using a less involved formula than for a pure computer program, since the burden for knowing whether certain months fall in a leap year shifts to the user. |
Unlike IBM 3278 terminals, WYLBUR was "of the time" of 1969. And rather than being a simulation of its display in 20-column mode, the "output" below is an adaptation of the actual display (as simple to create & use in any other text editor not using proportional spacing) for html. This entry is intended to show that WYLBUR could display 1969's calendar in a much smaller area than traditional alternatives (even without ORVYL). It also accomodates the display of Julian and even Old Style Calendars. One has to calculate the day for one Key Date in a given Calendar year, but using a less involved formula than for a pure computer program, since the burden for knowing whether certain months fall in a leap year shifts to the user. |
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A month appears as numbers (Roman numerals for leap years) below a column of dates which are defined as "Key Dates" for the corresponding months. A Key Day is the day of the week on which Key Dates occur in a Calendar year. Step A describes how to find the Key Day, which is used in Step B to display a calendar just by sliding the columns of dates in the lower output window. In WYLBUR, one slides the row of weekdays instead by inserting or deleting spaces to the left of " |
A month appears as numbers (Roman numerals for leap years) below a column of dates which are defined as "Key Dates" for the corresponding months. A Key Day is the day of the week on which Key Dates occur in a Calendar year. Step A describes how to find the Key Day, which is used in Step B to display a calendar just by sliding the columns of dates in the lower output window. In WYLBUR, one slides the row of weekdays instead by inserting or deleting spaces to the left of the first "S" (and vastly easier to align than here via javascript). |
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A. Calculate the Key Day: for a given date in the Gregorian Calendar, calculate the day on which its Key Dates occur using ([YE32 div |
A. Calculate the Key Day: for a given date in the Gregorian Calendar, calculate the day on which its Key Dates occur using ([YE32 div |
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16]+ YEAR div 4 + YEAR) mod 7. (For Julian & Old Style dates, omit the [YE32...] term where the non-century digits of the YEAR are |
16]+ YEAR div 4 + YEAR) mod 7. (For Julian & Old Style dates, omit the [YE32...] term where the non-century digits of the YEAR are |
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replaced by 32.) The remainder of the division by 7 gives the Key Day as follows: 0= |
replaced by 32.) The remainder of the division by 7 gives the Key Day as follows: 0=Sunday -> 6=Saturday. For the Gregorian 1969, (120 + 492 + 1969) mod 7 gives Friday as the Key Day. |
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B. Display the calendar for November: slide the columns so that 28 rests under the Key Day. One has as well the calendar for the |
B. Display the calendar for November: slide the columns so that 28 rests under the Key Day. One has as well the calendar for the |
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