The Sky over the Mornington Peninsula — December 2091
Highlights this month
- 2SunNeptune is stationary — begins retrograde (westward) motion. (8:24am)
- 4TueMercury at greatest morning elongation (20° from the Sun, mag −0.5) — best morning apparition. (10:26pm)
- 11TueVenus and Jupiter in conjunction — 2° apart. (3:28pm)
- 13ThuThe Moon passes Venus — 4° apart. (4:04pm)
- 14FriGeminids meteor shower peaks (up to 150/hr). A thin 17% Moon leaves the sky dark.
- 22SatSummer solstice.
- 22SatUrsids meteor shower peaks (up to 10/hr). A bright 88% Moon interferes badly this year.
- 26WedThe Moon passes Saturn — 3° apart. (12:59pm)
- 28FriSaturn at opposition — closest and brightest of the year, up all night in Gemini (mag −0.6). (2:10am)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Sat 1 | 5:50am | 8:27pm | 14h 37m | 10:20pm | 3:58am |
| Mon 10 | 5:50am | 8:35pm | 14h 46m | 10:31pm | 3:54am |
| Thu 20 | 5:52am | 8:42pm | 14h 50m | 10:39pm | 3:56am |
| Mon 31 | 5:59am | 8:46pm | 14h 47m | 10:42pm | 4:03am |
Days lengthen by about 10 minutes over the month.
The Moon
- Last QuarterTue 4, 10:01am
- New MoonTue 11, 12:57am
- First QuarterTue 18, 4:35am
- Full MoonWed 26, 9:02am
Perigee 9 Dec (359,600 km) · Apogee 21 Dec (405,600 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Sco | −0.6 | 4:49am | 12:00pm | 7:11pm | Hidden |
| Venus | Sgr | −3.8 | 8:31am | 3:50pm | 11:09pm | Evening |
| Mars | Sgr | 1.2 | 8:01am | 3:21pm | 10:41pm | Hidden |
| Jupiter | Sgr | −1.8 | 8:17am | 3:32pm | 10:46pm | Hidden |
| Saturn | Gem | −0.5 | 9:25pm | 2:17am | 7:03am | All night |
| Uranus | Aqr | 5.9 | 12:31pm | 6:53pm | 1:18am | Evening |
| Neptune | Leo | 7.9 | 12:29am | 5:53am | 11:16am | 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 17% 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 2091
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.
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Generated automatically from the MPAS sky engine on 29 August 2026.