Category:Declination

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

Consider the celestial sphere $C$ with observer $O$.

Let $P$ and $Q$ be the north celestial pole and south celestial pole respectively.

Let $X$ be a point on $C$.

Let $PXQ$ be the vertical circle through $X$.

Let $D$ be the point where the celestial equator intersects $PXQ$.

The length of the arc $DX$ of $PXQ$ is known as the declination of $X$.