Celestial mechanics Celestial mechanics Celestial mechanics is the branch of astronomy that deals with the motions of objects in outer space. Historically, celestial mechanics applies principles of physics (classical mechanics) to astronomical objects, such as stars and planets, to produce ephemeris data. As an astronomical field of study, celestial mechanics includes the sub-fields of orbital mechanics, which deals with the launching and orbits artificial satellites, and lunar theory, a specialty which deals with the complications of the orbit of the Moon. Modern celestial mechanics tends to divide between five broad fields of study: All of the above fields overlap, but are sometimes
Cel (goddess) Cel (goddess) Cel was the Etruscan goddess of the earth. On the Etruscan calendar, the month of "Celi" (September) is likely named for her. Her Greek counterpart is Gaia and her Roman is Tellus. In Etruscan mythology, Cel was the mother of the Giants. A bronze mirror from the 5th century BC depicts a theomachy in which Celsclan, "son of Cel," is a Giant attacked by Laran, the god of war. In Greek, "giant" comes from a word meaning "born from Gaia". Another mirror depicts anguiped Giants in the company of a goddess, possibly Cel, whose lower body is formed