Ancient humans used the moon as a calendar in the sky

Whether the moon was a timekeeper for early humans, as first argued during the Apollo missions, is still up for debate.

Different Calendars Humans Have Used Throughout History - Calendar

How 'Our Moon' shaped life on Earth and human history

What did ancient humans know about astronomy?

Space Exploration Technologies Archives - Universe Today

The Case for the Moon: Si, Supreme Ruler of the Gods, Sky and Earth

Ancient humans used the moon as a calendar in the sky

Moonstruck Science News

July 6, 2019 Science News

Calendar, Chronology, History, & Types

Moon - Wikipedia

July 6, 2019 Science News

How long did ancient people take to invent a calendar that would tell them when was the full moon going to be? - Quora

How to Sight the New Crescent Moon and Why It Matters for Muslims - Alhabib's Blog

The origin of the moon calendar - Living With The Moon