This pair of web pages, authored and curated by David P. Stern, describes early calculations of the Earth-Moon distance by Greek astronomers. Using lunar and solar eclipses, the astronomers Aristarchus and Hipparchus...

This web page, authored and curated by David P. Stern, outlines the math and applications of parallax. Parallax is the shift in the apparent direction to an object when it is viewed from two separated locations. It...

This series of webpages is part of a course, called Astronomy 161: The Solar System, offered by the Department of Physics and Astronomy at the University of Tennessee. This section covers the moons of Jupiter and their...

This is a series of web pages on the Earth's Moon. It includes information about the Moon as observed by the eye from Earth, its orbital period, its phases, appearance and the reason it always presents one face, There is...