celestial+equator
71Right 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… …
72Equatorial coordinate system — The equatorial coordinate system is probably the most widely used celestial coordinate system, whose equatorial coordinates are: * declination (delta) * right ascension (alpha) also RA , or hour angle (H) also HA It is the most closely related to …
73declination — declinational, adj. /dek leuh nay sheuhn/, n. 1. a bending, sloping, or moving downward. 2. deterioration; decline. 3. a swerving or deviating, as from a standard. 4. a polite refusal. 5. Astron. the angular distance of a heavenly body from the… …
74diurnal motion — Astron. the apparent daily motion, caused by the earth s rotation, of celestial bodies across the sky. * * * ▪ astronomy apparent daily motion of the heavens from east to west in which celestial objects seem to rise and set, a phenomenon… …
75physical science — physical scientist. 1. any of the natural sciences dealing with inanimate matter or with energy, as physics, chemistry, and astronomy. 2. these sciences collectively. [1835 45] * * * Introduction the systematic study of the inorganic world …
76Aryabhata — For other uses, see Aryabhata (disambiguation). Āryabhaṭa Statue of Aryabhata on the grounds of IUCAA, Pune. As there is no known information regarding his appearance, any image of Aryabhata originates from an artist s conception. Born 476 …
77solstice — /sol stis, sohl /, n. 1. Astron. a. either of the two times a year when the sun is at its greatest distance from the celestial equator: about June 21, when the sun reaches its northernmost point on the celestial sphere, or about December 22, when …
78longitude — Synonyms and related words: Antarctic Zone, Arctic Circle, Arctic Zone, Cartesian coordinates, Frigid Zones, Lambert conformal projection, Mercator projection, Miller projection, Torrid Zone, Tropic of Cancer, Tropic of Capricorn, Variable Zones …
79equinoctial line — noun the great circle on the celestial sphere midway between the celestial poles • Syn: ↑celestial equator, ↑equinoctial circle, ↑equinoctial • Derivationally related forms: ↑equinoctial (for: ↑equinoctial) …
80Solar 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 …
