Lecture 2 : Visual Astronomy -- Stars and Planets. Robert Fisher. Items. Add/Drop Day Office Hours Vote 5 PM Tuesday 5 PM Thursday 12 Noon Friday Course Webpage Questions. Review of Lecture 1.
Earth Image, Apollo 17 Crew
A great circle on a sphere divides the sphere into two hemispheres.
One can imagine the equator as an example of a great circle, but any
circle dividing the sphere is a great circle.