Mesopotamians

Mesopotamian Civilization : In astronomy, the Mesopotamians made astonishing progress. They could calculate the length of the day and the night.

Mesopotamians divided the whole day into 24 hours. They divided the sky into 12 parts, each assigned a name. This has come down to us as the 12 signs of zodiac.

Another remarkable achievement of the Mesopotamians was the invention of a lunar calendar, based on the moon.