The Astronomica, also known as the Astronomicon, is a Latin didactic poem about celestial phenomena, written in hexameters and divided into five books. The Astronomica was written c. AD 30–40 by a Roman poet whose name was likely Marcus Manilius; little is known of Manilius, and although there is evidence that the Astronomica was probably read by many other Roman writers, no surviving works explicitly quote him.

Marcus Manilius originally hailing from Syria, was a Roman poet, astrologer, and author of a poem in five books called Astronomica.