The Sky over the Mornington Peninsula — December 2139
Highlights this month
- 5SatNeptune in superior conjunction with the Sun — lost in the glare. (2:39am)
- 9WedMercury in superior conjunction with the Sun — lost in the glare. (6:35am)
- 14MonGeminids meteor shower peaks (up to 150/hr). A 41% Moon washes out fainter meteors for part of the night.
- 22TueSummer solstice.
- 22TueUrsids meteor shower peaks (up to 10/hr). A thin 1% Moon leaves the sky dark.
- 24ThuVenus and Jupiter in conjunction — 1° apart. (9:26pm)
- 25FriThe Moon passes Jupiter — 2° apart. (2:30am)
- 25FriThe Moon passes Venus — 3° apart. (2:40am)
- 25FriThe Moon passes Saturn — 3° apart. (6:41am)
- 27SunVenus and Saturn in conjunction — 1° apart. (2:03am)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Tue 1 | 5:50am | 8:27pm | 14h 36m | 10:19pm | 3:59am |
| Thu 10 | 5:50am | 8:35pm | 14h 45m | 10:30pm | 3:55am |
| Sun 20 | 5:52am | 8:42pm | 14h 50m | 10:38pm | 3:55am |
| Thu 31 | 5:58am | 8:46pm | 14h 47m | 10:42pm | 4:02am |
Days lengthen by about 11 minutes over the month.
The Moon
- Full MoonSun 6, 7:36am
- Last QuarterSun 13, 6:30pm
- New MoonMon 21, 8:08pm
- First QuarterTue 29, 12:15am
Perigee 3 Dec (363,800 km) · Apogee 15 Dec (405,000 km) · Perigee 31 Dec (368,800 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Oph | −1.0 | 5:59am | 1:29pm | 9:00pm | Hidden |
| Venus | Cap | −3.9 | 8:44am | 4:02pm | 11:19pm | Evening |
| Mars | Vir | 1.1 | 1:59am | 7:59am | 1:58pm | Morning |
| Jupiter | Cap | −1.8 | 9:36am | 4:38pm | 11:41pm | Evening |
| Saturn | Cap | 0.6 | 9:53am | 4:52pm | 11:52pm | Evening |
| Uranus | Vir | 5.5 | 2:36am | 9:01am | 3:26pm | Morning |
| Neptune | Oph | 8.0 | 5:19am | 12:31pm | 7:43pm | Hidden |
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 41% Moon washes out fainter meteors for part of the night.
- Ursids — peaks 22 December, radiant in Ursa Minor (up to 10/hr). A circumpolar northern shower whose radiant never rises from Victoria. A thin 1% Moon leaves the sky dark.
The solar system — December 2139
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 15 September 2026.