Angular+distance
81geoid — geoidal, adj. /jee oyd/, n. 1. an imaginary surface that coincides with mean sea level in the ocean and its extension through the continents. 2. the geometric figure formed by this surface, an ellipsoid flattened at the poles. [1880 85; < Gk… …
82Latitude — This article is about the geographical reference system. For other uses, see Latitude (disambiguation). Map of Earth Longitude (λ) Lines of longitude appear vertical with varying curvature in this projection, but are actually halves of great… …
83latitude — noun Etymology: Middle English, from Latin latitudin , latitudo, from latus wide; akin to Old Church Slavic postĭlati to spread Date: 14th century 1. archaic extent or distance from side to side ; width 2. angular distance from some specified… …
84Filar micrometer — A filar micrometer is a device used in astronomical telescopes for precision measurements. The word filar derives from Latin filum , a thread. It refers to the fine threads or wires used in the device. Construction and useThe filar micrometer… …
85latitude — /ˈlætətjud / (say latuhtyoohd), / tʃud/ (say choohd) noun 1. Geography a. the angular distance north or south from the equator of a point on the earth s surface, measured on the meridian of the point: Canberra has a latitude of 35°17 S and a… …
86mercury — /merr kyeuh ree/, n., pl. mercuries. 1. Chem. a heavy, silver white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations,… …
87Central angle — CoordinatesOn a sphere or ellipsoid, the central angle is delineated along a great circle.The usually provided coordinates of a point on a sphere/ellipsoid is its common latitude ( Lat ), phi,!, and longitude ( Long ), lambda,!. The point ,… …
88elongation — /i lawng gay sheuhn, i long , ee lawng , ee long /, n. 1. the act of elongating or the state of being elongated. 2. something that is elongated. 3. Astron. the angular distance, measured from the earth, between a planet or the moon and the sun or …
89true anomaly — noun the angular distance of a point in an orbit past the point of periapsis measured in degrees • Hypernyms: ↑angular distance * * * Astron. the anomaly of a planet; its angular distance from perihelion or aphelion …
90List of selected stars for navigation — The selected stars for navigation are often used for sextant observations. Fifty eight selected navigational stars are given a special status in the field of celestial navigation. Of the approximately 6,000 stars visible to the naked eye under… …
