The Sky over the Mornington Peninsula — December 2129
Highlights this month
- 1ThuMercury is stationary — begins retrograde (westward) motion. (7:43pm)
- 5MonJupiter is stationary — resumes direct (eastward) motion. (1:13am)
- 5MonVenus in superior conjunction with the Sun — lost in the glare. (2:28pm)
- 8ThuUranus is stationary — begins retrograde (westward) motion. (7:30pm)
- 11SunMercury in inferior conjunction with the Sun — lost in the glare. (4:12pm)
- 14WedGeminids meteor shower peaks (up to 150/hr). A thin 9% Moon leaves the sky dark.
- 18SunThe Moon passes Mars — 3° apart. (10:02pm)
- 19MonThe Moon passes Jupiter — 3° apart. (4:51pm)
- 21WedMercury is stationary — resumes direct (eastward) motion. (1:44pm)
- 22ThuSummer solstice.
- 22ThuUrsids meteor shower peaks (up to 10/hr). A bright 88% Moon interferes badly this year.
- 31SatMercury at greatest morning elongation (22° from the Sun, mag −0.3) — best morning apparition. (12:15am)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Thu 1 | 5:50am | 8:27pm | 14h 37m | 10:19pm | 3:58am |
| Sat 10 | 5:50am | 8:35pm | 14h 46m | 10:30pm | 3:54am |
| Tue 20 | 5:52am | 8:42pm | 14h 50m | 10:39pm | 3:55am |
| Sat 31 | 5:59am | 8:46pm | 14h 47m | 10:42pm | 4:03am |
Days lengthen by about 11 minutes over the month.
The Moon
- Last QuarterSun 4, 9:05am
- New MoonMon 12, 12:05am
- First QuarterSun 18, 6:49pm
- Full MoonMon 26, 1:51am
Apogee 3 Dec (404,800 km) · Perigee 15 Dec (366,500 km) · Apogee 31 Dec (405,400 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Oph | 2.9 | 5:30am | 12:38pm | 7:45pm | Hidden |
| Venus | Oph | −3.8 | 6:01am | 1:25pm | 8:50pm | Hidden |
| Mars | Psc | −0.0 | 1:23pm | 7:32pm | 1:42am | Evening |
| Jupiter | Psc | −2.3 | 2:25pm | 8:19pm | 2:18am | Evening |
| Saturn | Vir | 0.6 | 3:12am | 9:44am | 4:17pm | Morning |
| Uranus | Leo | 5.4 | 12:40am | 6:06am | 11:32am | Morning |
| Neptune | Lib | 8.0 | 4:07am | 11:03am | 5:59pm | 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 thin 9% 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 bright 88% Moon interferes badly this year.
The solar system — December 2129
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 12 September 2026.