The Calendar
What the atlas records for this date, across the traditions it covers.
Observed On This Date
Feast / celebration
The Thursday after Trinity Sunday, the sixtieth day after Easter
The Thursday after Trinity Sunday.
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.