sidereal hour angle


Also found in: Acronyms.

sidereal hour angle

The 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]
(astronomy)
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°.

sidereal hour angle

sidereal hour angleclick for a larger image
The angle about the celestial pole between the celestial meridian of the first point of Aries and the celestial meridian of the body, measured westward from the celestial meridian of the first point of Aries.