The Sky over the Mornington Peninsula — December 2109
Highlights this month
- 6FriMercury is stationary — begins retrograde (westward) motion. (4:12am)
- 13FriThe Moon passes Jupiter — 2° apart. (6:59pm)
- 14SatVenus in inferior conjunction with the Sun — lost in the glare. (2:11am)
- 14SatJupiter is stationary — begins retrograde (westward) motion. (2:18am)
- 14SatGeminids meteor shower peaks (up to 150/hr). A bright 61% Moon interferes badly this year.
- 15SunMercury in inferior conjunction with the Sun — lost in the glare. (10:16pm)
- 17TueThe Moon passes Mars — 1° apart. (9:39am)
- 22SunSummer solstice.
- 22SunUrsids meteor shower peaks (up to 10/hr). A thin 0% Moon leaves the sky dark.
- 25WedMercury is stationary — resumes direct (eastward) motion. (11:39pm)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Sun 1 | 5:50am | 8:27pm | 14h 37m | 10:19pm | 3:58am |
| Tue 10 | 5:50am | 8:35pm | 14h 45m | 10:30pm | 3:55am |
| Fri 20 | 5:52am | 8:42pm | 14h 50m | 10:39pm | 3:55am |
| Tue 31 | 5:59am | 8:46pm | 14h 47m | 10:42pm | 4:03am |
Days lengthen by about 11 minutes over the month.
The Moon
- Full MoonSat 7, 10:42pm
- Last QuarterSun 15, 6:45pm
- New MoonSun 22, 9:44am
- First QuarterSun 29, 12:36pm
Apogee 5 Dec (406,200 km) · Perigee 21 Dec (359,100 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Oph | 7.0 | 6:05am | 1:19pm | 8:31pm | Hidden |
| Venus | Oph | −3.3 | 5:48am | 1:04pm | 8:20pm | Hidden |
| Mars | Vir | 1.4 | 2:26am | 8:42am | 2:58pm | Morning |
| Jupiter | Leo | −2.1 | 12:25am | 5:44am | 11:03am | Morning |
| Saturn | Cap | 0.6 | 9:22am | 4:27pm | 11:32pm | Evening |
| Uranus | Tau | 5.6 | 6:38pm | 11:34pm | 4:34am | Evening |
| Neptune | Vir | 7.9 | 2:12am | 8:21am | 2:30pm | Morning |
Meteor showers
- Geminids — peaks 14 December, radiant in Gemini (up to 150/hr). The richest shower of the year; the radiant reaches a useful altitude after local midnight, so it rewards southern observers well. A bright 61% Moon interferes badly this year.
- Ursids — peaks 22 December, radiant in Ursa Minor (up to 10/hr). A circumpolar northern shower whose radiant never rises from Victoria. A thin 0% Moon leaves the sky dark.
The solar system — December 2109
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 5 September 2026.