Ecliptic — The ecliptic is the apparent path that the Sun traces out in the sky during the year. As it appears to move in the sky in relation to the stars, the apparent path aligns with the planets throughout the course of the year. More accurately, it is… … Wikipedia
Indian astronomy — the earliest textual mention of which is given in the religious literature of India (2nd millennium BCE) became an established tradition by the 1st millennium BCE, when IAST|Jyotiṣa Vedānga and other ancillary branches of learning called Vedangas … Wikipedia
Right ascension — (abbrev. RA; symbol α) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.ExplanationRA is the celestial equivalent of… … Wikipedia
Celestial coordinate system — For other uses of Celestial , see Celestial (disambiguation). Orientation of Astronomical Coordinates Orientation of the galactic, ecliptic and equatorial coordinate systems, projected on the celestial sphere, showing the galactic equator (black) … Wikipedia
Hipparchus — (Greek polytonic|Ἵππαρχος; ca. 190 BC ndash; ca. 120 BC) was a Greek astronomer, geographer, and mathematician of the Hellenistic period.Hipparchus was born in Nicaea (now Iznik, Turkey), and probably died on the island of Rhodes. He is known to… … Wikipedia
Numerical model of solar system — A numerical model of the solar system is a set of mathematical equations, which, when solved, give the approximate positions of the planets as a function of time. Attempts to create such a model established the more general field of celestial… … Wikipedia
Numerical model of the Solar System — A numerical model of the Solar System is a set of mathematical equations, which, when solved, give the approximate positions of the planets as a function of time. Attempts to create such a model established the more general field of celestial… … Wikipedia
ecliptic — ecliptically, adv. /i klip tik/, n. 1. Astron. a. the great circle formed by the intersection of the plane of the earth s orbit with the celestial sphere; the apparent annual path of the sun in the heavens. b. an analogous great circle on a… … Universalium