Category:Definitions/Parallactic Angles

This category contains definitions related to Parallactic Angles.
Related results can be found in Category:Parallactic Angles.

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

Let $\SS_1$ be the arc of the great circle between $x$ and the zenith.

Let $\SS_2$ be the arc of the great circle between $x$ and the north celestial pole.

The parallactic angle is defined as the (spherical) angle between $\SS_1$ and $\SS_2$.