Terrestrial Longitude

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Terrestrial Longitude

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Longitude on the earth; the arc of a parallel, or the angle at the pole, between the prime meridian and the meridian of a point on the earth. See coordinate, table VI. Terrestrial longitude is named for the datum used to measure it. Astronomical longitude is the angle between the plane of the reference meridian and the plane of the celestial meridian. Geodetic 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. [[/a>|/a> ]]

References

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