WordReference Random House Unabridged Dictionary of American English © 2026
sidereal hour an′gle, [Astron.]
  1. Astronomythe angle, measured westward through 360°, between the hour circle passing through the vernal equinox and the hour circle of a celestial body. Cf. hour angle. 

'sidereal hour angle' also found in these entries (note: many are not synonyms or translations):

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