Celestial mechanics fix" method used anciently with numbers. Research Artwork Course notes Associations Simulations 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
Zisa (goddess) Zisa (goddess) Zisa or Cisa is a goddess in Germanic paganism. "Zisa" is an etymological double of Tyr or Ziu according to 19th century scholar Jacob Grimm who suggests that Zisa may be the same figure as Tyr's unnamed wife, mentioned by Loki in the 13th century Poetic Edda poem "Lokasenna". Zisa is mentioned in manuscripts from the 12th to 14th centuries which reference a victory against the Roman Empire attributed to the goddess. The anniversary of this victory was celebrated on the festival day of September 28 and involved games and merrymaking. Scholar Stephan Grundy, and authors Nigel Pennick