Daylight hours in Gros Islet
Gros Islet gets 12h 57m of daylight on its longest day in June, and 11h 18m on its shortest in December — a difference of 1h 39m across the year.
How fast the days change
Around 22 March, Gros Islet gains or loses about 0.8 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 America/St_Lucia local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 06:31 | 17:54 | 11h 23m | 12:13 |
| February | 06:27 | 18:08 | 11h 42m | 12:17 |
| March | 06:11 | 18:14 | 12h 03m | 12:12 |
| April | 05:50 | 18:17 | 12h 27m | 12:03 |
| May | 05:36 | 18:23 | 12h 47m | 12:00 |
| June | 05:35 | 18:32 | 12h 57m | 12:04 |
| July | 05:43 | 18:36 | 12h 53m | 12:09 |
| August | 05:50 | 18:26 | 12h 36m | 12:08 |
| September | 05:52 | 18:05 | 12h 13m | 11:58 |
| October | 05:54 | 17:44 | 11h 49m | 11:49 |
| November | 06:04 | 17:32 | 11h 29m | 11:48 |
| December | 06:20 | 17:38 | 11h 18m | 11:59 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:07 | 18:14 | 12h 07m |
| June solstice | 21 Jun | 05:36 | 18:34 | 12h 57m |
| September equinox | 22 Sep | 05:52 | 18:00 | 12h 07m |
| December solstice | 21 Dec | 06:23 | 17:40 | 11h 18m |
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.