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...

This website, authored by Ricky Leon Murphy of Astronomy Online, is a collection of references, images, and information for general astronomy. This work covers topics from the basics of science and observation through...

Ricky Leon Murphy decided to create this website when he was working towards a master�s degree in astronomy, and he still keeps it updated regularly, along with the assistance of his wife, Chanthirar. The site has been...

Each day a different image or photograph of a celestial object is featured. Pictures are selected for their particular beauty or astronomical interest, and each one is accompanied by a brief caption written by a...

This is the web site home for the Teacher Leaders in Research Based Science Education (TLRBSE) program supported by the National Optical Astronomy Observatory. It is designed to retain and renew middle and high school...