Magi Society
- Advocates the use of planetary geometry, declinations and chiron. Articles, lessons, software and FAQ.
- http://www.magiastrology.com/

Treehouse Mountain
- Asteroid ephemerides, keywords and lessons, with book list and archives.
- http://www.treehousemountain.com/index.htm

The Centaur Research Project
- Ephemerides, mythological information, research material and news.
- http://www.robertvonheeren.de

The Astrology of The Centaurs
- Wide selection of essays and astronomical data on the astrological centaurs, much of which is available also in Spanish. Home also of the freeware calculation program Riyal.
- http://www.expreso.co.cr/centaurs/

Chiron Astrology
- Research and writings about Chiron, by Martin Lass. Book excerpts, library and biography.
- http://martinlass.com/chiron.htm