The Sky over the Mornington Peninsula — December 2155
Highlights this month
- 7SunMercury is stationary — begins retrograde (westward) motion. (8:57am)
- 8MonVenus and Mars in conjunction — 0.8° apart. (9:07pm)
- 14SunGeminids meteor shower peaks (up to 150/hr). A bright 76% Moon interferes badly this year.
- 17WedMercury in inferior conjunction with the Sun — lost in the glare. (3:03am)
- 17WedThe Moon passes Saturn — 1° apart. (4:24am)
- 21SunUranus in superior conjunction with the Sun — lost in the glare. (8:42pm)
- 22MonSummer solstice.
- 22MonUrsids meteor shower peaks (up to 10/hr). A thin 6% Moon leaves the sky dark.
- 27SatMercury is stationary — resumes direct (eastward) motion. (4:42am)
- 27SatThe Moon passes Venus — 2° apart. (9:20pm)
- 28SunJupiter at opposition — closest and brightest of the year, up all night in Gemini (mag −2.6). (4:34am)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Mon 1 | 5:50am | 8:27pm | 14h 36m | 10:19pm | 3:59am |
| Wed 10 | 5:49am | 8:35pm | 14h 45m | 10:30pm | 3:55am |
| Sat 20 | 5:52am | 8:42pm | 14h 50m | 10:38pm | 3:55am |
| Wed 31 | 5:58am | 8:46pm | 14h 47m | 10:42pm | 4:02am |
Days lengthen by about 11 minutes over the month.
The Moon
- First QuarterMon 1, 11:32pm
- Full MoonTue 9, 9:13am
- Last QuarterWed 17, 1:55pm
- New MoonWed 24, 6:05pm
- First QuarterWed 31, 9:30am
Apogee 14 Dec (405,600 km) · Perigee 26 Dec (359,900 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Oph | 5.5 | 6:15am | 1:31pm | 8:45pm | Hidden |
| Venus | Cap | −3.9 | 8:49am | 4:06pm | 11:22pm | Evening |
| Mars | Sgr | 1.2 | 8:37am | 3:52pm | 11:08pm | Evening |
| Jupiter | Gem | −2.6 | 9:31pm | 2:20am | 7:04am | Morning |
| Saturn | Leo | 0.8 | 1:30am | 7:15am | 12:59pm | Morning |
| Uranus | Sgr | 5.8 | 6:18am | 1:41pm | 9:03pm | Hidden |
| Neptune | Sgr | 8.0 | 7:40am | 2:55pm | 10:10pm | 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 bright 76% 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 6% Moon leaves the sky dark.
The solar system — December 2155
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 27 September 2026.