The Sky over the Mornington Peninsula — December 2099
Highlights this month
- 8TueThe Moon passes Jupiter — 3° apart. (2:00am)
- 8TueThe Moon passes Saturn — 5° apart. (11:37am)
- 14MonGeminids meteor shower peaks (up to 150/hr). A thin 6% Moon leaves the sky dark.
- 15TueThe Moon passes Venus — 2° apart. (7:11am)
- 19SatMercury in superior conjunction with the Sun — lost in the glare. (4:53pm)
- 20SunNeptune is stationary — begins retrograde (westward) motion. (12:38am)
- 22TueThe Moon passes Mars — 2° apart. (9:29am)
- 22TueSummer solstice.
- 22TueUrsids meteor shower peaks (up to 10/hr). A bright 74% Moon interferes badly this year.
- 27SunUranus is stationary — resumes direct (eastward) motion. (8:50am)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Tue 1 | 5:50am | 8:27pm | 14h 37m | 10:20pm | 3:58am |
| Thu 10 | 5:50am | 8:35pm | 14h 46m | 10:31pm | 3:54am |
| Sun 20 | 5:52am | 8:42pm | 14h 50m | 10:39pm | 3:56am |
| Thu 31 | 5:59am | 8:46pm | 14h 47m | 10:42pm | 4:03am |
Days lengthen by about 10 minutes over the month.
The Moon
- Last QuarterSat 5, 3:50pm
- New MoonSat 12, 10:09am
- First QuarterSun 20, 1:28am
- Full MoonMon 28, 12:05am
Perigee 9 Dec (366,600 km) · Apogee 21 Dec (404,800 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Oph | −1.1 | 5:38am | 1:04pm | 8:32pm | Hidden |
| Venus | Sgr | −3.8 | 8:34am | 3:52pm | 11:11pm | Evening |
| Mars | Psc | −0.8 | 3:37pm | 9:09pm | 2:44am | Evening |
| Jupiter | Vir | −1.6 | 2:34am | 8:56am | 3:19pm | Morning |
| Saturn | Vir | 0.7 | 2:53am | 9:18am | 3:43pm | Morning |
| Uranus | Psc | 5.8 | 3:07pm | 8:49pm | 2:35am | Evening |
| Neptune | Leo | 7.9 | 1:16am | 6:59am | 12:43pm | 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 6% 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 74% Moon interferes badly this year.
The solar system — December 2099
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 1 September 2026.