Hour-circle definition

A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles.
noun
0
0
(astron.) Any great circle of the celestial sphere which passes through the celestial poles and is therefore perpendicular to the celestial equator.
noun
0
0
A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles. An hour circle is equivalent to a meridian on Earth and is used in describing the position of a celestial body with respect to an observer's celestial meridian.
0
0
Advertisement

Other Word Forms

Noun

Singular:
hour-circle
Plural:
hour circles