Category:Parallactic Angles

This category contains results about Parallactic Angles.
Definitions specific to this category can be found in Definitions/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 $\SS_2$.