Calendars

Time Systems

Calendars were created to help communities coordinate planting, travel, ceremonies, and daily life. They turn the cycles of the Sun, Moon, seasons, and civic traditions into shared days, months, and years.

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Ancient Egypt · A civil calendar organized around the Nile seasons.

Current Egyptian Date Loading calendar position... Idealized teaching alignment
12Months30 days each
3Seasons4 months each
5Extra daysAt year’s end
365DaysIn the civil year

How This Calendar Works

Akhet
Flood season
Peret
Emergence & growing
Shemu
Harvest season

The extra days are called epagomenal days. The original civil calendar had no leap day, so its dates gradually drifted relative to the seasons.

Ancient Egyptian Timekeeping

Day & night hours
Daylight and darkness were each divided into 12 hours. Their lengths changed with the season rather than staying fixed at 60 minutes.
Clocks & tools
Shadow clocks and sundials measured daylight; water clocks and star groups called decans helped measure the night.
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Date conversion
This display uses an idealized August 29 teaching anchor, not a universal historical conversion. Month marks are simplified hieroglyph-inspired symbols.
Modern comparison
Gregorian months vary in length and use leap years; the ancient Egyptian civil calendar used equal-length months without leap-day correction.

Sources & Credits

Calendar dates, cycles, and comparisons on this page are calculated locally in your browser.

This page does not request a separate external calendar API.