| FN-Handbuch Pferdewirt |
|
| Link "http://images-eu.amazon.com/images/P/3885423901.03.MZZZZZZZ.jpg" |
| Die grosse Wand |
 |
| Link "http://images-eu.amazon.com/images/P/3000177744.03.MZZZZZZZ.jpg" |
| Die Sonne beobachten |
 |
| Link "http://images-eu.amazon.com/images/P/3879739242.03.MZZZZZZZ.jpg" |
| Die Sonne beobachten |
 |
| Link "http://images-eu.amazon.com/images/P/3827413060.03.MZZZZZZZ.jpg" |
| Solar Astronomy Handbook |
 |
| Link "http://www.willbell.com/handbook/images/SolarAstronomy.gif" |
Folgende Links wurden insgesamt gefunden:
http://astro1.physik.uni-siegen.de/users/mike/scratch/kometen_beobachten_draft.pdf