The Calendar
What the atlas records for this date, across the traditions it covers.
Observed On This Date
Commemoration of a person or event
Fixed Gregorian date, 1 December, every year.
Marks an international day of awareness for the AIDS pandemic caused by HIV infection, observed every year since 1988.
This Week In Space and Astronomy 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.