Before we can understand the positions and motions of
celestial bodies, it is necessary to have an understanding of
*spherical geometry*. Spherical geometry is the study
of geometry on the surface of a sphere and is the spherical
analogue of the planar geometry you will have studied at school.
In this series of lectures we will explore some of the basic concepts
of spherical geometry. We will then show how these concepts can be
applied by solving some everyday problems to do with the measurement
of position and distance on the surface of the Earth.

*©Vik Dhillon, 30th September 2009*