Difference between revisions of "Longitude"
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Longitude
[[/a>|/a>
]]
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.
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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
