Daylight hours in Jiagedaqi
Jiagedaqi gets 16h 25m of daylight on its longest day in June, and 8h 03m on its shortest in December — a difference of 8h 22m across the year.
How fast the days change
Around 17 March, Jiagedaqi gains or loses about 3.8 minutes of daylight every day.
Enough to notice over a fortnight, though the seasons arrive more gently here than further from the equator.
Sunrise and sunset by month
On the 15th of each month, in Asia/Shanghai local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 07:37 | 16:07 | 8h 30m | 11:52 |
| February | 06:55 | 17:00 | 10h 05m | 11:57 |
| March | 05:57 | 17:47 | 11h 50m | 11:52 |
| April | 04:50 | 18:37 | 13h 47m | 11:43 |
| May | 03:56 | 19:23 | 15h 27m | 11:39 |
| June | 03:31 | 19:56 | 16h 25m | 11:43 |
| July | 03:49 | 19:49 | 16h 01m | 11:49 |
| August | 04:31 | 19:04 | 14h 32m | 11:48 |
| September | 05:18 | 17:58 | 12h 40m | 11:38 |
| October | 06:05 | 16:53 | 10h 47m | 11:29 |
| November | 06:57 | 15:58 | 9h 01m | 11:28 |
| December | 07:37 | 15:39 | 8h 03m | 11:38 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 05:46 | 17:55 | 12h 09m |
| June solstice | 21 Jun | 03:32 | 19:58 | 16h 27m |
| September equinox | 22 Sep | 05:29 | 17:43 | 12h 14m |
| December solstice | 21 Dec | 07:41 | 15:41 | 8h 00m |
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 China
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.