An excellent set of pdf manuals for those wishing to know more about astrophysics, and they are free. Variable Star Astronomy, formerly published as Hands-On Astrophysics, was developed for anyone who is interested in astronomy and in learning more about the behaviors and properties of stars. The conversion of the curriculum to electronic format has been completed for the Student Manual and the Teacher Pages. The supporting materials - slides, video and star charts have also been converted, and the VSTAR software is in progress. The AAVSO, with support from the Chandra X-Ray Center, is delighted to make this rich educational content available to you, free-of-charge, below. http://www.aavso.org/education/vsa/ -- Jeff Hopkins HPO SOFT Counting Photons http://www.hposoft.com/Astro/astro.html Hopkins Phoenix Observatory 7812 West Clayton Drive Phoenix, Arizona 85033-2439 U.S.A. (623)849-5889 (623) 247-1190 (Fax) www.hposoft.com -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.