The Calendar
What the atlas records for this date, across the traditions it covers.
Observed On This Date
Commemoration of a person or event
28 December; 29 December in the Byzantine calendar
29 December in the Byzantine calendar.
Dates for the Hebrew and Islamic calendars are the tabular reckoning, which is what a printed calendar prints. Communities that begin a month on a sighted crescent may differ by a day, and differ from one another by place.