The Sky over the Mornington Peninsula — September 2017
Highlights this month
- 5TueMercury is stationary — resumes direct (eastward) motion. (1:45am)
- 5TueNeptune at opposition — closest and brightest of the year, up all night in Aquarius (mag 7.8). (3:37pm)
- 12TueMercury at greatest morning elongation (18° from the Sun, mag −0.4) — best morning apparition. (8:11pm)
- 22FriThe Moon passes Jupiter — 4° apart. (8:09pm)
- 23SatSpring equinox.
- 27WedThe Moon passes Saturn — 3° apart. (10:35am)
Sun & twilight
| Date | Sunrise | Sunset | Day length | Astro. dark begins | ends |
|---|---|---|---|---|---|
| Fri 1 | 6:42am | 5:58pm | 11h 16m | 7:26pm | 5:14am |
| Sun 10 | 6:28am | 6:06pm | 11h 37m | 7:34pm | 5:01am |
| Wed 20 | 6:13am | 6:14pm | 12h 02m | 7:43pm | 4:45am |
| Sat 30 | 5:57am | 6:23pm | 12h 26m | 7:53pm | 4:28am |
Days lengthen by about 70 minutes over the month.
The Moon
- Full MoonWed 6, 5:07pm
- Last QuarterWed 13, 4:29pm
- New MoonWed 20, 3:31pm
- First QuarterThu 28, 12:54pm
Perigee 14 Sep (369,900 km) · Apogee 27 Sep (404,800 km)
The planets
Rise/set for mid-month at The Briars.
| Planet | In | Mag | Rise | Transit | Set | Best |
|---|---|---|---|---|---|---|
| Mercury | Leo | −0.7 | 5:42am | 11:12am | 4:41pm | Hidden |
| Venus | Leo | −3.7 | 5:12am | 10:29am | 3:46pm | Hidden |
| Mars | Leo | 1.8 | 5:47am | 11:17am | 4:46pm | Hidden |
| Jupiter | Vir | −1.5 | 7:46am | 2:16pm | 8:45pm | Evening |
| Saturn | Oph | 0.3 | 10:49am | 6:05pm | 1:26am | Evening |
| Uranus | Psc | 5.7 | 8:55pm | 2:29am | 7:58am | Morning |
| Neptune | Aqr | 7.8 | 5:12pm | 11:38pm | 6:09am | All night |
The solar system — September 2017
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 July 2026.