sidereal hour angle
Also found in: Acronyms.
sidereal hour angleThe angular distance measured westward along the celestial equator from a catalog equinox to the intersection of the hour circle passing through a celestial body. It is equal to 360° minus the right ascension (in degrees).
sidereal hour angle[sī′dir·ē·əl ¦au̇r ‚aŋ·gəl]
The angle along the celestial equator formed between the hour circle of a celestial body and the hour circle of the vernal equinox, measuring westward from the vernal equinox through 360°.