Horizontal sundial calculations: Difference between revisions
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</pre> |
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=={{header|ZX Spectrum Basic}}== |
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{{trans|ERRE}} |
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<lang zxbasic>10 DEF FN r(x)=x*PI/180 |
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20 DEF FN d(x)=x*180/PI |
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30 INPUT "Enter latitude (degrees): ";latitude |
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40 INPUT "Enter longitude (degrees): ";longitude |
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50 INPUT "Enter legal meridian (degrees): ";meridian |
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60 PRINT "Latitude: ";latitude |
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70 PRINT "Longitude:";longitude |
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80 PRINT "Legal meridian: ";meridian |
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90 PRINT '" Sun Dial" |
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100 PRINT "Time hour angle hour line ang." |
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110 PRINT "________________________________" |
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120 FOR h=6 TO 18 |
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130 LET hra=15*h-longitude+meridian-180 |
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140 LET hla=FN d(ATN (SIN (FN r(latitude))*TAN (FN r(hra)))) |
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150 IF ABS (hra)>90 THEN LET hla=hla+180*SGN (hra*latitude) |
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160 PRINT h;" ";hra;" ";hla |
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170 NEXT h</lang> |
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