Vitamin D

The sun, month by month

Sunrise and sunset in London in September

On September 1 in London the sun rises at 06:15 and sets at 19:45; on day 30 it rises at 07:04 and sets at 18:36. Over the month the day gets 117 minutes shorter.

Sunrise06:38
Sunset19:12
Golden hour18:28–19:12
Day length12 h 33 min

Day by day

All times are local to London. Dawn and dusk mark civil twilight.

DayDawnSunriseSunsetDuskDay length
105:4106:1519:4520:2013 h 30 min
205:4206:1719:4220:1713 h 26 min
305:4406:1919:4020:1513 h 22 min
405:4606:2019:3820:1213 h 18 min
505:4806:2219:3520:1013 h 14 min
605:4906:2419:3320:0713 h 09 min
705:5106:2519:3120:0513 h 05 min
805:5306:2719:2820:0213 h 01 min
905:5506:2919:2619:6012 h 57 min
1005:5606:3019:2419:5712 h 53 min
1105:5806:3219:2119:5512 h 49 min
1205:6006:3419:1919:5212 h 45 min
1306:0206:3519:1619:5012 h 41 min
1406:0306:3719:1419:4812 h 37 min
1506:0506:3819:1219:4512 h 33 min
1606:0706:4019:0919:4312 h 29 min
1706:0806:4219:0719:4012 h 25 min
1806:1006:4319:0419:3812 h 21 min
1906:1206:4519:0219:3512 h 17 min
2006:1306:4718:6019:3312 h 13 min
2106:1506:4818:5719:3012 h 09 min
2206:1706:5018:5519:2812 h 05 min
2306:1906:5218:5219:2612 h 01 min
2406:2006:5318:5019:2311 h 57 min
2506:2206:5518:4819:2111 h 52 min
2606:2406:5718:4519:1811 h 48 min
2706:2506:5818:4319:1611 h 44 min
2806:2707:0018:4119:1411 h 40 min
2906:2907:0218:3819:1111 h 36 min
3006:3007:0418:3619:0911 h 32 min

Approximate astronomical values: they can shift a minute or two from year to year.

What about vitamin D in September?

In September, the typical synthesis window in London runs from 12:00 to 15:00: with medium skin and a t-shirt, ~15 min at the best moment is enough.

See the London vitamin D guide