Astronomy and calendars
English Perpetual calendar December 2021
Deutsch Espanol Italiano day calendar - Calendar 2021

(for BC Years use astronomical notation)

December 2021
123Fase Luna4
5678910Fase Luna11
Fase Luna19202122232425
26Fase Luna2728293031
Gregorian Calendar
Events of the month
Astronomical events
IconaDescrizioneDataOra T.U.
New MoonNew MoonSaturday 4 07:41
<br>(Antarctic region)
(Antarctic region)
Saturday 4 07:29
First QuarterFirst QuarterSaturday 11 01:29
Full MoonFull MoonSunday 19 04:35
Solstizio d´invernoTuesday 21 15:46
Last quarterLast quarterMonday 27 02:27
Christian Calendar
Event Day
Times are in UT - Universal Time (Greenwich Mean Time); for lunar phases and eclipses the error in within 2 min.

This perpetual calendar works for any year since 4713AC (-4712). The date of change from Julian Calendar to Gregorian is Oct 15 1582 (Julian Oct 5 1582).
For years before 321, when Emperor Constantine I introduced by decree the week cycle and Sunday rest, you will see the Roman Calendar with Kalendae, Nonae and Idi and the nundinal cycle instead of the week. You can always see the modern style calendar selecting from the dropdown menu.
For years between 46BC (first year of the Julian Calendar) and 4AD I tried to take into account the leap year error (which the priests interposed every three years instead of four) up to 8BC when August corrected this error suppressing three leap years.
For years before 46AC (-45) this calendar uses a analeptic julian calendar which obviously is different from the calendar used by Romans at the time (Numan Calendar).


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