Bulgarian Astronomical Web Sites
| Institute of Astronomy, Bulgarian Academy of Sciences | http://astro.bas.bg/ |
| Department of Astronomy, Sofia University | http://astro.uni-sofia.bg/ |
| National Astronomy Olympiad | http://astro-olymp.org/ |
| National Program Hunters for Sky Treasures | http://www.geocities.com/astronomiabg/ |
| Astronomical Observatories and Planetariums in Bulgaria | http://observatories.hit.bg/ |
| Astronomical club „Helios“ – Haskovo, Bulgaria | http://heliosclub.hit.bg/ |
Other Astronomical Web Sites
| International Astronomy Olympiad | http://www.issp.ac.ru/iao/ |
| European Southern Observatory (ESO) | http://eso.org/ |
| European Association for Astronomical Education (EAAE) | http://www.eaae-astro.org/ |
| European Program Catch a Star | http://eso.org/outreach/eduoff/edu-prog/catchastar/ |
| European Program Venus Transit 2004 | http://www.vt-2004.org/ |