The Calendar
What the atlas records for this date, across the traditions it covers.
Observed On This Date
New year
At the June solstice.
Held at the June solstice, which is the winter solstice in the southern Andes.
This Week In Mathematics 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.