Computing Atlas

How Computing Was Built
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The Calendar

Wednesday 24 December 2025

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

The Day BeforeTodayThe Day AfterAll Of December 2025

Already Underway

Las Posadas
Procession
16-24 December, the nine nights before Christmas
Day 9 of 9
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The Week Ahead

Thursday 25 DecemberDies Natalis Solis Invicti
Sunday 28 DecemberThe Holy Innocents

This Week In Computing 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.