geocentric solar ecliptic
1Geocentric coordinates — are an Earth centered system of locating objects in the solar system in three dimensions along the Cartesian X, Y and Z axes. They are differentiated from topocentric coordinates which use the observer s location as the reference point for… …
2Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …
3Timeline of solar system astronomy — Timeline of solar system astronomyAntiquity* 2137 BC, October 22 Chinese astronomers record a solar eclipse *ca. 2000 BC Chinese determine that Jupiter needs 12 years to complete one revolution of its orbit. * 2nd millennium BC earliest possible… …
4Definition of planet — Photograph of the crescent planet Neptune (top) and its moon Triton (center) …
5Universe — • Presents a history of astronomy Catholic Encyclopedia. Kevin Knight. 2006. Universe Systems of the Universe † …
6Solstice — For other uses, see Solstice (disambiguation). UTC date and time of solstices and equinoxes[1] year Equinox Mar Solstice June Equinox Sept Solstice Dec day time day time day time day time 2004 20 …
7Secular variations of the planetary orbits — The Secular Variations of the Planetary Orbits (French: Variations Séculaires des Orbites Planétaires, abbreviated as VSOP) is a semi analytic theory describing the long term changes (secular variation) in the orbits of the planets Mercury to… …
8celestial mechanics — the branch of astronomy that deals with the application of the laws of dynamics and Newton s law of gravitation to the motions of heavenly bodies. [1815 25] * * * Branch of astronomy that deals with the mathematical theory of the motions of… …
9Equinox — This article is about the astronomical event when the sun is at zenith over the Equator. For other uses, see Equinox (disambiguation). For the same event happening on other planets and setting up a celestial coordinate system, see Equinox… …
10Hipparchus — /hi pahr keuhs/, n. 1. died 514 B.C., tyrant of Athens 527 514. 2. c190 c125 B.C., Greek astronomer. * * * or Hipparchos born , Nicaea, Bithynia died after 127 BC, Rhodes? Greek astronomer and mathematician. He discovered the precession of the… …
