The Antikythera Mechanism, a remarkable device discovered in an ancient shipwreck off the coast of Greece, has long been a ...

Ancient history of noting retrogrades Claudius Ptolemy, an ancient Greek astronomer, had one of the first written records of explaining retrograde motion in the second century A.D.

Researchers from the CNRS, Sorbonne Université and Tyndale House (affiliated with the University of Cambridge) have recently found fragments of the Star Catalogue composed by the Greek astronomer ...

This would make it the oldest-known star catalog of its kind in the world, predating a star chart by ancient Greek astronomer Hipparchus by more than 200 years.