Daylight hours in Tuen Mun
Tuen Mun gets 13h 30m of daylight on its longest day in June, and 10h 46m on its shortest in December — a difference of 2h 43m across the year.
How fast the days change
Around 17 March, Tuen Mun gains or loses about 1.3 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 Asia/Hong_Kong local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 07:06 | 18:00 | 10h 55m | 12:33 |
| February | 06:55 | 18:20 | 11h 25m | 12:38 |
| March | 06:33 | 18:33 | 12h 00m | 12:33 |
| April | 06:04 | 18:44 | 12h 40m | 12:24 |
| May | 05:44 | 18:56 | 13h 12m | 12:20 |
| June | 05:39 | 19:09 | 13h 30m | 12:24 |
| July | 05:48 | 19:11 | 13h 23m | 12:30 |
| August | 06:01 | 18:56 | 12h 55m | 12:28 |
| September | 06:10 | 18:28 | 12h 17m | 12:19 |
| October | 06:20 | 17:59 | 11h 39m | 12:09 |
| November | 06:36 | 17:40 | 11h 04m | 12:08 |
| December | 06:55 | 17:42 | 10h 46m | 12:19 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:28 | 18:34 | 12h 07m |
| June solstice | 21 Jun | 05:40 | 19:11 | 13h 30m |
| September equinox | 22 Sep | 06:12 | 18:21 | 12h 08m |
| December solstice | 21 Dec | 06:59 | 17:44 | 10h 46m |
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.
Other cities in Hong Kong
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.