https://www.inverse.com/article/21211-n ... -astronomySome 3,000 years ago, the ancient Babylonians divided the Zodiac into an even 12 pieces. Each “slice” was represented by a constellation that the sun would appear to pass through at differing points of the year as the Earth orbited around the sun.
The Babylonians, NASA says, cheated a bit. The sun didn’t actually pass through each constellation for a consistent, month-long timespan. It varied immensely. On top of that, the Babylonians knew there was a thirteenth constellation, Ophiuchus, but that wouldn’t have lined up with their calendar, so they just didn’t include it. Also, the sky has shifted because Earth’s axis has changed a bit over the course of 3,000 years.
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