Longitude

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Longitude

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1. Angular distance, along a primary great circle, from the adopted reference point; the angle between a reference plane through the polar axis and a second plane through that axis. See coordinate, table. </dd>
Terrestrial longitude is the arc of a parallel, or the angle at the pole, between the prime meridian and the meridian of a point on the earth, measured eastward or westward from the prime meridian through 180 degrees, and labeled E or W to indicate the direction of measurement. Astronomical longitude is the angle between the plane of the reference meridian and the plane through the polar axis and the normal to the spheroid. Geodetic and sometimes astronomical longitude are also called geographic longitude. Geodetic longitude is used for charts. Assumed longitude is the longitude at which an observer is assumed to be located for an observation or computation. Difference of longitude at which an observer is assumed to be located for an observation or computation. Difference of longitude is the smaller angle at the plor or the shorter arc of a parallel between the meridians of two places, expressed in angular measure. Fictitious longitude is the arc of the fictitious equator between the prime fictitious meridian and any given fictitious meridian. Grid longitude is angular distance between a prime grid meridian and any given grid meridian. Oblique longitude is angular distance between a prime oblique meridian and any given oblique meridian. Transverse or inverse longitude is angular distance between a prime transverse meridian and any given transverse meridian. Celestial longitude is angular distance east of the vernal equinox, along the ecliptic. Galactic longitude is angular distance east of sidereal hour angle 80 degrees, along the galactic equator. </dd>
2. Of a planet in solar system, the sum of two angles: the celestial longitude of the ascending node of the planetary orbit, and the angle measured eastward from the ascending node along the orbit to the position of the planet. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use