Daylight hours in Vinh
Vinh gets 13h 15m of daylight on its longest day in June, and 11h 01m on its shortest in December — a difference of 2h 14m across the year.
How fast the days change
Around 22 March, Vinh gains or loses about 1.1 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/Bangkok local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 06:32 | 17:40 | 11h 08m | 12:06 |
| February | 06:25 | 17:57 | 11h 32m | 12:11 |
| March | 06:05 | 18:06 | 12h 01m | 12:06 |
| April | 05:40 | 18:14 | 12h 34m | 11:57 |
| May | 05:23 | 18:23 | 13h 01m | 11:53 |
| June | 05:20 | 18:35 | 13h 15m | 11:57 |
| July | 05:28 | 18:37 | 13h 09m | 12:03 |
| August | 05:38 | 18:24 | 12h 46m | 12:01 |
| September | 05:44 | 18:00 | 12h 15m | 11:52 |
| October | 05:51 | 17:35 | 11h 44m | 11:43 |
| November | 06:03 | 17:19 | 11h 16m | 11:41 |
| December | 06:21 | 17:22 | 11h 01m | 11:52 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:01 | 18:08 | 12h 07m |
| June solstice | 21 Jun | 05:21 | 18:36 | 13h 15m |
| September equinox | 22 Sep | 05:46 | 17:54 | 12h 08m |
| December solstice | 21 Dec | 06:25 | 17:25 | 11h 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 Vietnam
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.