The Calendar
What the atlas records for this date, across the traditions it covers.
Observed On This Date
New year
1 Muharram
Tabular reckoning. Communities that begin the month on a sighted crescent may differ by a day, and differ from each other by place.
This Week In Computing History
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.