Difference between revisions of "Sidereal Hour Angle"
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Sidereal Hour Angle
</dt>
(abbr SHA). Angular distance west of the vernal
equinox; the arc of the celestial
equator, or the angle at the celestial pole, between the hour circle
of the vernal equinox and the hour circle of a point on the celestial
sphere, measured westward from the hour circle of the vernal equinox
through 360 degrees.
</dd>
Angular distance east of the vernal equinox, through 24 hours, is right
ascension.
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
