In
astronomy,
right ascension is, along with
declination, one of the two equatorial coordinates used to define position on the celestial sphere.
It is similar to
longitude on the
Earth, but is measured from a zero point known as the
First Point of Aries.
(The First Point of Aries is the point where the
ecliptic meets the celestial equator in the
constellation of
Pisces.)
It is conventionally measured in hours, minutes and seconds, rather than degrees, with one hour equal to 15 degrees.
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