Portal:Astronomy/Events/May 2009
| 6 May | Eta Aquariids peak |
| 9 May, 04:02 | Full moon |
| 14 May, 03:00 | Moon at apogee |
| 18 May, 10:00 | Mercury at inferior conjunction |
| 24 May, 12:12 | New moon |
| 26 May, 04:00 | Moon at perigee |
| 6 May | Eta Aquariids peak |
| 9 May, 04:02 | Full moon |
| 14 May, 03:00 | Moon at apogee |
| 18 May, 10:00 | Mercury at inferior conjunction |
| 24 May, 12:12 | New moon |
| 26 May, 04:00 | Moon at perigee |