Science Atlas

How We Know What We Know
The Calendar

Wednesday 31 January 2029

What the atlas records for this date, across the traditions it covers.

Observed On This Date

Seasonal turning point
15 Shevat

Already Underway

Fast / abstinence
The whole of Ramadan, the ninth month
Day 17 of 29
Tabular reckoning, and stored as twenty-nine days so the month can never be reported as running into Eid al-Fitr. The month is twenty-nine or thirty days and begins on a sighted crescent in most communities.

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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.