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, 31 May, every year.
Marks an annual World Health Organization campaign informing the public about the dangers of tobacco use and the business practices of tobacco companies.
This Week In Science 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.