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Additional
meridian (astronomy)
English Wikipedia - The Free Encyclopedia
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Meridian (astronomy)
An
(astronomical) meridian
is the
great circle
passing through the
celestial poles
, the
zenith
, and the
nadir
of a particular location. Consequently, it contains also the horizon's north and south points, and it is perpendicular to the
celestial equator
and to the
celestial horizon
. A celestial meridian matches the projection, onto the
celestial sphere
, of a
terrestrial meridian
. Hence there are an infinite number of meridians.
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