The Sky over the Mornington Peninsula — December 2123
Highlights this month
- 2ThuMercury in inferior conjunction with the Sun — lost in the glare. (11:13pm)
- 4SatVenus and Mars in conjunction — 0.7° apart. (9:55pm)
- 12SunMercury is stationary — resumes direct (eastward) motion. (1:01pm)
- 13MonThe Moon passes Jupiter — 5° apart. (9:57am)
- 14TueGeminids meteor shower peaks (up to 150/hr). A thin 12% Moon leaves the sky dark.
- 21TueMercury at greatest morning elongation (22° from the Sun, mag −0.4) — best morning apparition. (8:20am)
- 22WedSummer solstice.
- 22WedUrsids meteor shower peaks (up to 10/hr). A thin 16% Moon leaves the sky dark.
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Wed 1 | 5:51am | 8:27pm | 14h 36m | 10:19pm | 3:59am |
| Fri 10 | 5:50am | 8:35pm | 14h 45m | 10:30pm | 3:55am |
| Mon 20 | 5:52am | 8:42pm | 14h 50m | 10:38pm | 3:55am |
| Fri 31 | 5:58am | 8:46pm | 14h 48m | 10:42pm | 4:02am |
Days lengthen by about 12 minutes over the month.
The Moon
- Full Moon SupermoonFri 3, 4:28pm
- Last QuarterFri 10, 8:31am
- New MoonSat 18, 9:17am
- First QuarterSun 26, 10:14am
Perigee 4 Dec (357,100 km) · Apogee 18 Dec (406,300 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Sco | −0.1 | 4:49am | 11:51am | 6:53pm | Hidden |
| Venus | Cap | −3.9 | 8:39am | 3:58pm | 11:16pm | Evening |
| Mars | Sgr | 1.2 | 8:19am | 3:37pm | 10:55pm | Hidden |
| Jupiter | Vir | −1.6 | 2:55am | 9:26am | 3:57pm | Morning |
| Saturn | Cnc | 0.0 | 11:51pm | 5:02am | 10:09am | Morning |
| Uranus | Cnc | 5.5 | 11:14pm | 4:14am | 9:11am | Morning |
| Neptune | Lib | 8.0 | 3:32am | 10:15am | 4:58pm | 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 thin 12% Moon leaves the sky dark.
- Ursids — peaks 22 December, radiant in Ursa Minor (up to 10/hr). A circumpolar northern shower whose radiant never rises from Victoria. A thin 16% Moon leaves the sky dark.
The solar system — December 2123
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 10 September 2026.