Ancient Egypt: The 365-Day Year

While the Mesopotamians struggled with the moon, the ancient Egyptians focused on the sun and the stars. Their calendar, developed over 5,000 years ago, was the first to recognize that a year is approximately 365 days long.

The Civil Calendar

The Egyptian civil calendar was remarkably simple: 12 months of exactly 30 days each, followed by 5 "epagomenal" days (extra days) at the end of the year to reach 365. This predictability was essential for the massive bureaucracy required to manage the Nile’s resources.

Sirius and the Nile

The Egyptian year began with the **Heliacal Rising of Sirius** (Sopdet). When the brightest star in the sky appeared on the horizon just before sunrise, it signaled that the Nile would soon flood—the most critical event in the Egyptian agricultural cycle.

The Quarter-Day Problem

Because the Egyptians did not use a leap year, their calendar drifted by one day every four years. It took 1,460 years (a **Sothic Cycle**) for the calendar to return to its original alignment with the rising of Sirius.

Conclusion

The Egyptian calendar prioritized the solar cycle over the lunar one, a decision that would eventually lead to the Julian and Gregorian calendars we use today. On the Epoch Clock, we are synchronized with the sun—a mission that began on the banks of the Nile.