hour circle

Noun

Meaning

a great circle on the celestial sphere that passes through both celestial poles

Source: WordNet

Synonyms

meridian armillary sphere

Hypernyms

great circle

Examples

Right ascension (abbreviated RA; symbol α) is the angular distance measured eastward along the celestial equator from the vernal equinox to the hour circle of the point in question. Source: Internet

Glossary, s.v. hour angle, hour circle, sidereal time. Source: Internet

The hour angle of a point is the angle between two planes: one containing the Earth's axis and the zenith (the meridian plane), and the other containing the Earth's axis and the given point (the hour circle passing through the point). Source: Internet

Close letter words and terms

hour angle hour basis hour change hour each day hour every day hour glass