Created by author Nick Strobel, "Astronomy Notes" is an educational resource for introductory astronomy classes for undergraduates. This section describes: the celestial sphere, coordinate systems, the motion of the...

A large collection of solar images and information. Includes an illustration and explanation of the refraction of light to form rainbows and other atmospheric illusions.

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 site, created by Fred Espenak of the National Aeronautics and Space Administration (NASA) looks at solar eclipses, lunar eclipses, planetary transits, and moon phases. This site tells you about past occurrences of...

Lunar Eclipse: Fact and Myth consists of three major parts: 1) a description of the physical occurrence of an eclipse, 2) a method of computing the time a specific eclipse will occur, and 3) a survey of various folklore...