Sidereal hour



noun
1.
a 24th part of a sidereal day

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    noun, Astronomy. 1. the angle, measured westward through 360°, between the hour circle passing through the vernal equinox and the hour circle of a celestial body.

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    noun, Astronomy. 1. See under month (def 5). noun 1. Also called calendar month. any of the twelve parts, as January or February, into which the calendar year is divided. 2. the time from any day of one calendar month to the corresponding day of the next. 3. a period of four weeks or 30 […]



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