|Help and Information to the everlasting calendar|
Help and Characteristics
NotesThe program computes calendar dates up to 1582/10/4 in the Julian calendar, starting from 1582/10/15 in the Gregorian calendar, which ends in the year 4099 [… rather rather]. Extrapolation into the past does not require a historical basis. The days in between were cancelled within the calendar reform. For the calendar reform the dating of the Vernal equinox on march 21 was determining.
I optimized the astronomical algorithms for the computation of moon and seasons for a little, so that errors are not to be excluded from up to 7 minutes at 200 years difference (15 min. at 400 years), not at least by the transformation in world time (UT). For Central Standard Time (CST) subtract 6 hours from UTC.
Sunrise and sunset refer to the upper sun edge and consider the atmospheric refraction. The deviation amounts up to 2 minutes. The daylight saving time is not considered.
The computation of the Easter date is a direct conversion of the valid rule and should fit without exception in every year > 325. The results agree in the years 1 to 4099 with the Gauss Easter formula, which can be found in their obviously complete version at Dietrich Kracht. One notes however that e.g. some south European countries depend on the Easter date of the orthodox churches. Further information in addition as well as various program translations provides GM Arts.
The feasts and their origins were conscientiously investigated, however I cannot put my hand in the fire for all data provided here, particularly since in the program consideres the current rules.
By the use of completely independent algorithms the program is carefully tested. Nevertheless are
Copyright © 1998-2007 Thomas's Köhler, www.thkoehler.de. All rights reserved.
… up to the beetle picture (entirely stolen of the "Tagesspiegel" which linked this program (to 00/3/26, topic time conversion) to nice way)