This program calculates the holidays in Germany for any year between -4712 and 5000. The weekday of a specific date may also be obtained. Extreme years for easter-dates are e.g. 1818 and 2038.- The Gregorian and Julian calendars, as well as the Islamic and Hebrew calendars, and the moon-phases used here follow Jean Meeus: "Astronomical Algorithms", chapter 8 and 49 etc.. Also the solstices, precision about 1 min between 1950 and 2050. Leap years are indicated after the new years entry. Date and Time in UTC. Date-format is dd.mm.yyyy
Year = -4712 here corresponds to conventional "Year 4713 BC", while in conventional BC/AD-counting year 0 does not exist. The Gregorian calender starts with 15.Oct.1582, Julian ends with 4.Oct.1582. - The values for ΔT used here seem slightly more actual than those used in http://astropixels.com/ephemeris/phasescat/phasescat.html, which otherwise is one of the best Moon-references.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the license or any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License (www.gnu.org/licenses/) for more details. If errors are encountered, kindly inform: email@example.com - Heiner Müller-Krumbhaar - Last update 8.feb.2023.