Скачать или смотреть 🌙 The World’s First Calendar Was Created 5,000 Years Ago!

Welcome to 1 Day 1 Math Fact! 🎉
Today, we’re diving back thousands of years to Mesopotamia, where the ancient Sumerians lived. They weren’t just the first to record numbers on clay tablets, but also the creators of one of the earliest calendars in human history.

By simply observing the moon 🌙, the Sumerians realized that one lunar cycle lasted about 29–30 days. From this simple discovery came the very first lunar calendar.

This calendar shaped their daily lives. It told them when to plant, when to harvest, and even when to hold temple rituals ⛪. What’s amazing is that they did all this without telescopes or modern technology—just careful sky watching.

The Sumerian lunar calendar was passed down through civilizations and eventually inspired the modern calendars we still use today. ✨

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Reference:
Ossendrijver, Mathieu. “The Moon and Planets in Ancient Mesopotamia.” Oxford Research Encyclopedia of Planetary Science, 2020. DOI:10.1093/acrefore/9780190647926.013.198

Widell, Magnus. Ur III Economy and Bureaucracy: The Neo-Sumerian Cuneiform Tablets in the Hood Museum of Art, Dartmouth College (I). Orient 55 (2020): 117-154. DOI:10.5356/orient.55.117