Philosophy Atlas

How Thinkers Disagree
The Calendar

Sunday 5 April 2026

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

Observed On This Date

Feast / celebration
The first Sunday after the ecclesiastical full moon falling on or after 21 March, by the Gregorian computus
Western reckoning. The Orthodox date is the second rule on this holiday.
Feast / celebration
The fifty days from Easter Sunday to Pentecost, kept as a single festal season
Day 1 of 50

Already Underway

Feast / celebration
15-21 Nisan; 15-22 Nisan in the Diaspora
Day 4 of 7
Seven days in the Land of Israel and among Reform communities. Eight in much of the Diaspora.

The Week Ahead

Sunday 12 AprilBright Week
Sunday 12 AprilDivine Mercy Sunday

This Week In Philosophy History

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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.