Calendar invoice

The calendar calculation comprises the calculation of a calendar in a specific calendar system in order to create a calendar .

Calendar systems

The systems on which the calendar calculation is based are

• astronomical calendars based on actual astronomical events ;
• arithmetic calendars that use a purely computational scheme.

Calendar calculation

The main components of the calendar calculation are the calculation of the calendar date , in particular the New Year as the starting point, and in our calendar system in particular the days of the week ( weekday calculation ) and public holidays ( holiday calculation ). When it comes to public holidays, a distinction is made between immovable and movable. Most moving holidays are based on Easter ( Computus ).

Calendar calculation tools

• Endless calendar
• Astronomy programs and calendar programs as software for calendar calculation
• Julian date as a continuous count, which can then be converted into the data of the respective calendar system
• Tupyakov calendar to choose from one of 14 possible annual calendars
• Zeller's congruence and Doomsday method for calculating the day of the week
• Easter formula by Carl Friedrich Gauß , which is still used today to calculate the Easter festival in this way or slightly modified
• Metonic cycle , the basis of lunisolar calendars

Historical tools for calendar calculation

• Calendar constructions , constructions for astronomical observations
• historical devices such as astronomical clocks, some of which are very old.

Examples

• Fiscal year - the tax base
• Liturgical calendar (Roman Catholic) - the Christian church year

See also

• List of calendar systems - overview of common and historical calendar systems

Individual evidence

1. ↑ Tobias Hürter: Star calculator from the sea. PM Magazin , issue 10/2006 ( Memento from September 28, 2007 in the Internet Archive )