Category:Hour Angle

This category contains results about Hour Angle.
Definitions specific to this category can be found in Definitions/Hour Angle.

Let $P$ be a point on the celestial sphere.

The hour angle of $P$ is the angular distance measured westwards along the celestial equator from the vernal equinox.

That is, it is the angular distance measured westwards along the celestial equator between the observer's meridian and the hour circle of $P$.