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Hour angle
In
astronomy
and
celestial navigation
, the
hour angle
is one of the coordinates used in the
equatorial coordinate system
to give the direction of a point on the
celestial sphere
. The hour angle of a point is the angle between two planes: one containing the
Earth's axis
and the
zenith
(the
meridian
plane), and the other containing the
Earth's axis
and the given point (the
hour circle
passing through the point).
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