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equatorial coordinate system
(Encyclopedia) CE5 Equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celesti...ecliptic
(Encyclopedia)ecliptic ēklĭpˈtĭk, ĭ– [key], the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution a...solstice
(Encyclopedia)solstice sŏlˈstĭs [key] [Lat.,=sun stands still], in astronomy, either of the two points on the ecliptic that lie midway between the equinoxes (separated from them by an angular distance of 90°). ...perturbation
(Encyclopedia)perturbation pŭrˌtərbāˈshən [key], in astronomy and physics, small force or other influence that modifies the otherwise simple motion of some object. The term is also used for the effect produce...aurora borealis
(Encyclopedia)aurora borealis ôstrāˈlĭs [key], luminous display of various forms and colors seen in the night sky. The aurora borealis of the Northern Hemisphere is often called the northern lights, and the aur...Emirates of the South, Federation of the
(Encyclopedia)Emirates of the South, Federation of the: see South Arabia, Federation of. ...Federation of the Emirates of the South
(Encyclopedia)Federation of the Emirates of the South: see South Arabia, Federation of. ...Text of the Constitution of the United States
(Encyclopedia) Text1 of the Constitution of the United States Preamble Article I Article II Article III Article IV Article V Article VI Article VII Amendment I Amendment II Am...Mountains of the Moon
(Encyclopedia)Mountains of the Moon, Africa: see Ruwenzori. ...Moon, Mountains of the
(Encyclopedia)Moon, Mountains of the, Africa: see Ruwenzori. ...Browse by Subject
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