celestial meridian — noun : a great circle of the celestial sphere passing through the celestial poles and the zenith … Useful english dictionary
meridian — [mə rid′ē ən] adj. [OFr meridien < L meridianus, of noon, southern < meridies, noon, the south < older medidies < medius,MID1 + dies, day: see DEITY] 1. of or at noon 2. of or passing through the highest point in the daily course of… … English World dictionary
meridian — Synonyms and related words: Antarctic Zone, Arctic Circle, Arctic Zone, Frigid Zones, Lambert conformal projection, Mercator projection, Miller projection, Torrid Zone, Tropic of Cancer, Tropic of Capricorn, Variable Zones, acmatic, acme,… … Moby Thesaurus
meridian angle — noun : the angle between the upper branch of the celestial meridian of an observer and the hour circle of a celestial object measured either westward or eastward from zero to 180 degrees compare hour angle * * * Astron. the angle, measured… … Useful english dictionary
meridian angle — Astron. the angle, measured eastward or westward through 180°, between the celestial meridian of an observer and the hour circle of a celestial body. Cf. hour angle. * * * … Universalium
meridian altitude — The altitude of a celestial body when the celestial meridian of the observer is either 000° or 180° … Aviation dictionary
meridian passage — The time at which a heavenly body crosses the observer’s celestial meridian … Aviation dictionary
Celestial meridiator — is a vertical imaginary line that goes over the celestial poles and crosses (perpendicular to) the celestial equator. There are two celestial meridiators on the celestial sphere: Equinox meridiator and Solstice meridiator.NameThe meridiators are… … Wikipedia
Celestial navigation — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… … Wikipedia
Celestial sphere — [ celestial equator.] In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of gigantic radius , concentric and coaxial with the Earth. All objects in the sky can be thought of as lying upon the sphere. Projected from… … Wikipedia
