| Astronomical Organizations (8) | Astronomy Clubs (4) |
| Astronomy Guides (2) | Astronomy Publications (3) |
| Astronomy Software (1) | Favorite Software (6) |
| NASA (4) | Observatories (1) |
| On Line Shops (3) |
Astronomy ClubsOther astronomy clubs from around the U.S.
| Michigan – Delta Astronomical Society | |
| Michigan – Grand Rapids Amateur Astronomical Association Grand Rapids Amateur Astronomical Association | |
| Michigan – Kalamazoo Astronomical Society Kalamazoo Astronomical Society | |
| Michigan – Muskegon Astronomical Society Muskegon Astronomical Society |
