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Additional
Right ascension
English Wikipedia - The Free Encyclopedia
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Right ascension
Right ascension
(abbreviated
RA
; symbol
a
) is the angular distance measured eastward along the
celestial equator
from the
vernal equinox
to the
hour circle
of the point in question. When combined with
declination
, these
astronomical coordinates
specify the direction of a point on the
celestial sphere
in the
equatorial coordinate system
.
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