Binary Stars
  • free astronomy software for Macintosh computers, complete with manuals
  • teaches binary star concepts
  • may be used in a classroom or lab setting, or
  • for self-education
  • for Windows operating systems, try the CLEA web site for educational astronomy software
  • see also Dan Bruton's Eclipsing Binary Stars web site
  • for observational lab exercises, see the URSA web site

System Requirements:

  • Any Macintosh, iMac, G3, G4, or other PowerMac computer running System 7.1 to 9.2 (Classic Systems), or OS X running the Classic Environment, or OS X version 10.4 or greater.
  • Adobe Acrobat Reader (free) for the manuals
  • A printer may be needed in a lab setting

Click below to read a brief program description
Click below to download the free software now for the Classic Environment only
Mac.Period & Mac Chart
Dates of Minima
Binary Star
Click here to download ALL the software for Mac OS X (10.4 to 10.6).


Click here for some interesting Eclipsing Binary Star Facts.


About the Author: Claud H. Sandberg Lacy is an active research astronomer teaching at The University of Arkansas. His main research area is binary stars (big surprise!). He has published over 103 research papers.

If you have questions or need information, just ask us.

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since 2/12/98

Last site update 5/9/2006