Daylight hours in Georgetown
Georgetown gets 12h 35m of daylight on its longest day in December, and 11h 40m on its shortest in June — a difference of 0h 55m across the year.
How fast the days change
Around 12 March, Georgetown gains or loses about 0.4 minutes of daylight every day.
Barely perceptible — near the equator the length of the day hardly changes at all, and the seasons announce themselves through rain and heat instead.
Sunrise and sunset by month
On the 15th of each month, in Atlantic/St_Helena local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 06:51 | 19:22 | 12h 32m | 13:07 |
| February | 07:01 | 19:22 | 12h 21m | 13:11 |
| March | 07:02 | 19:11 | 12h 09m | 13:06 |
| April | 06:59 | 18:55 | 11h 56m | 12:57 |
| May | 07:01 | 18:46 | 11h 45m | 12:54 |
| June | 07:08 | 18:48 | 11h 40m | 12:58 |
| July | 07:12 | 18:54 | 11h 42m | 13:03 |
| August | 07:06 | 18:57 | 11h 51m | 13:02 |
| September | 06:51 | 18:54 | 12h 03m | 12:52 |
| October | 06:35 | 18:51 | 12h 16m | 12:43 |
| November | 06:27 | 18:56 | 12h 29m | 12:42 |
| December | 06:35 | 19:10 | 12h 35m | 12:52 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 07:01 | 19:08 | 12h 07m |
| June solstice | 21 Jun | 07:09 | 18:49 | 11h 40m |
| September equinox | 22 Sep | 06:47 | 18:53 | 12h 07m |
| December solstice | 21 Dec | 06:38 | 19:13 | 12h 35m |
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.