#coordinate-systems

This post discusses spherical triangles in astronomy. What are their uses, their properties, and some basic related formulas.

We discussed the great and small circle in our post about the circles in spherical astronomy. A brief summary for the previous post is as follows, The great circle is one of the most fundamental concepts. When a plane intersects a sphere at its mid-point, it forms a great circle. One, and only one great circle can uniquely intersect two points on the surface of a sphere that are not…