Daylight hours in Douglas
Douglas gets 17h 09m of daylight on its longest day in June, and 7h 23m on its shortest in December — a difference of 9h 46m across the year.
How fast the days change
Around 17 March, Douglas gains or loses about 4.4 minutes of daylight every day.
That is quick enough to notice week to week, which is why spring seems to arrive all at once this far from the equator.
Sunrise and sunset by month
On the 15th of each month, in Europe/Isle_of_Man local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 08:29 | 16:25 | 7h 57m | 12:27 |
| February | 07:37 | 17:26 | 9h 48m | 12:32 |
| March | 06:32 | 18:21 | 11h 49m | 12:26 |
| April | 06:16 | 20:19 | 14h 03m | 13:17 |
| May | 05:14 | 21:14 | 16h 00m | 13:14 |
| June | 04:44 | 21:52 | 17h 09m | 13:18 |
| July | 05:04 | 21:43 | 16h 39m | 13:23 |
| August | 05:55 | 20:49 | 14h 54m | 13:22 |
| September | 06:51 | 19:35 | 12h 44m | 13:13 |
| October | 07:46 | 18:21 | 10h 35m | 13:03 |
| November | 07:46 | 16:18 | 8h 32m | 12:02 |
| December | 08:31 | 15:54 | 7h 23m | 12:13 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:19 | 18:30 | 12h 11m |
| June solstice | 21 Jun | 04:44 | 21:55 | 17h 11m |
| September equinox | 22 Sep | 07:03 | 19:17 | 12h 14m |
| December solstice | 21 Dec | 08:35 | 15:56 | 7h 20m |
The equinoxes give almost exactly twelve hours of daylight everywhere on earth — "almost" because sunrise is defined by the sun's upper edge rather than its centre, and the atmosphere bends its light over the horizon before it has really arrived. Both lengthen the day by a few minutes.
Assumptions
- Sea-level horizon. Hills, mountains and buildings all delay sunrise and bring sunset forward, sometimes by a lot in a valley.
- Standard refraction. Sunrise is taken at −0.833°, allowing for the sun's disc and average atmospheric bending. Unusual air conditions shift it by a minute or two.
- Local clock time, with daylight saving applied from the IANA timezone database.