The Sky over the Mornington Peninsula — September 2121
Highlights this month
- 4ThuMercury is stationary — begins retrograde (westward) motion. (10:55pm)
- 7SunThe Moon passes Saturn — 1° apart. (1:48am)
- 16TueThe Moon passes Mars — 5° apart. (4:51am)
- 18ThuMercury in inferior conjunction with the Sun — lost in the glare. (5:47pm)
- 23TueSpring equinox.
- 27SatMercury is stationary — resumes direct (eastward) motion. (2:59am)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Mon 1 | 6:43am | 5:58pm | 11h 16m | 7:26pm | 5:15am |
| Wed 10 | 6:29am | 6:06pm | 11h 37m | 7:34pm | 5:01am |
| Sat 20 | 6:13am | 6:14pm | 12h 01m | 7:43pm | 4:45am |
| Tue 30 | 5:57am | 6:23pm | 12h 26m | 7:53pm | 4:28am |
Days lengthen by about 70 minutes over the month.
The Moon
- Last QuarterThu 4, 9:39am
- New MoonFri 12, 8:43am
- First QuarterSat 20, 9:28am
- Full Moon SupermoonSat 27, 2:32am
Apogee 12 Sep (406,300 km) · Perigee 26 Sep (356,800 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Vir | 4.5 | 6:22am | 12:32pm | 6:43pm | Hidden |
| Venus | Leo | −3.7 | 5:34am | 10:58am | 4:22pm | Hidden |
| Mars | Vir | 1.5 | 8:06am | 2:52pm | 9:37pm | Evening |
| Jupiter | Leo | −1.6 | 5:02am | 10:15am | 3:27pm | Hidden |
| Saturn | Gem | 0.0 | 3:06am | 7:55am | 12:43pm | Morning |
| Uranus | Gem | 5.6 | 3:40am | 8:30am | 1:19pm | Morning |
| Neptune | Vir | 8.0 | 8:08am | 2:43pm | 9:18pm | Evening |
The solar system — September 2121
Evening sky Morning sky Up much of the night Lost in the Sun’s glare
Open the full interactive orrery ↗ — fast-forward, pick any date, toggle the Moon and more.
Looking for an earlier month? Browse all past monthly guides →
Generated automatically from the MPAS sky engine on 9 September 2026.