Answer
The Babylonians were an ancient civilization that existed in Mesopotamia from the 18th to 6th centuries BCE. They were known for their advanced mathematics, astronomy, and astrology. Hipparchus, a Greek astronomer who lived in the 2nd century BCE, is believed to have used Babylonian observations and techniques in his own work. For example, Hipparchus is credited with developing the first star catalog, which was based on Babylonian observations.