An algebra-based overview of elementary and pre-telescope astronomy. Topics covered include sundials, seasons, calendars, precession, shape and rotation of Earth, Greek astronomy, the path to heliocentric theory and...

Created by David P. Stern, this set of three web pages provides a calculation of paths, times, and distances for a flight to Mars and back. The author uses a Hohmann transfer ellipse between two circular orbits. This is...

This 2-page color fact sheet briefly describes NASA-s Kepler mission, its instruments, and ground system. Also included are tables listing the instrument parameters and a listing of the major institutions involved....

This is a set of 7 illustrated web pages discussing Kepler's laws. Included are equations and properties of conic sections, the scale of the solar system, the energy equation for Keplerian motion, Newton's "Universal...

This web page, authored and curated by David P. Stern, provides the lecture notes for an overview of Kepler's laws. A section is devoted to each of Kepler's three most prominent theories. It includes historical notes...