Category:Definitions/Astronomical Triangles

This category contains definitions related to Astronomical Triangles.
Related results can be found in Category:Astronomical Triangles.

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

Consider the following $3$ great circles on $\CC$:

the great circle between $P$ and the zenith

the great circle between $P$ and the north celestial pole

the great circle between the zenith and the north celestial pole.

The spherical triangle formed by these $3$ great circles is called the astronomical triangle with respect to $P$.