<p>Tehran (35.7$^\circ$ N) has 23 fewer minutes of daylight than Rafsanjan (30.4$^\circ$ N) on Nov 26 because the Sun is 21$^\circ$ south of the celestial equator and Tehran is 5.3$^\circ$ farther north than Rafsanjan.
For the same reason, the north pole has 24-hour night and the south pole has 24-hour daylight at this time of year.
On May 26, when the Sun's declination is 21$^\circ$ north, Tehran has 25 more minutes of daylight than Rafsanjan does, and the north pole has 24 more hours of daylight than the south pole does.</p>

CC BY-SA 3.0
2016-11-26T14:12:58.427Z
2016-11-26T14:12:58.427Z
Mike G
<p>I would have commented but I don't have enough reputation. 
Sunrise and sunset times may depend on a lot of factors. For example if your city had a big mountain in the west, the sunset would be earlier than what it would have been with the sea instead of the mountain. These things may depends on a lot of factors and you should know the morphology of the zone where the cities are to answer properly. For example there may be mountains in the east of Tehran and that would explain the late sunrise. I don't know the details but I think morphology of the earth is the answer. On a big scale you can say it's a sphere, locally it's everything but smooth.</p>

CC BY-SA 3.0
2016-11-26T15:56:45.730Z
Standard sunrise and sunset calculations neglect terrain.
Mike G
CC BY-SA 3.0
2016-11-26T16:15:45.187Z
Really? I mean why is that? Why giving a precise time for sunrise and sunset if it is not accurate?
RenatoRenatoRenato
CC BY-SA 3.0
2016-11-27T01:01:29.277Z
They do account for atmospheric refraction and the apparent width of the solar disk. Accounting for terrain would require computing different times for every hill or valley.
Mike G
CC BY-SA 3.0
2016-11-26T12:47:17.190Z
2016-11-26T12:47:17.190Z
RenatoRenatoRenato
<p>For 26 Nov 2016:</p>

<p>Consider Tehran with 06:51 sunrise and 16:52 sunset.
Another city is Rafsanjan in 850KM southeast of Tehran, sunrise is 6:21 and 16:45 for sunset.</p>

<p>Time zone of two cities is +3.5</p>

<p>Why difference of sunrise is 30 minutes while sunset is 7 minutes?</p>

<time>
Difference of sunset and sunrise of two cities are different
Farhadix
# Difference of sunset and sunrise of two cities are different

(Asked by: username_0 on 2016-11-26)

For 26 Nov 2016:

Consider Tehran with 06:51 sunrise and 16:52 sunset.
Another city is Rafsanjan in 850KM southeast of Tehran, sunrise is 6:21 and 16:45 for sunset.

Time zone of two cities is +3.5

Why difference of sunrise is 30 minutes while sunset is 7 minutes?

**Tags:** time

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## 2 answers

### Answer by username_1 on 2016-11-26. Score: 1

Tehran (35.7$^\circ$ N) has 23 fewer minutes of daylight than Rafsanjan (30.4$^\circ$ N) on Nov 26 because the Sun is 21$^\circ$ south of the celestial equator and Tehran is 5.3$^\circ$ farther north than Rafsanjan.
For the same reason, the north pole has 24-hour night and the south pole has 24-hour daylight at this time of year.
On May 26, when the Sun's declination is 21$^\circ$ north, Tehran has 25 more minutes of daylight than Rafsanjan does, and the north pole has 24 more hours of daylight than the south pole does.


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### Answer by username_2 on 2016-11-26. Score: 0

I would have commented but I don't have enough reputation.
Sunrise and sunset times may depend on a lot of factors. For example if your city had a big mountain in the west, the sunset would be earlier than what it would have been with the sea instead of the mountain. These things may depends on a lot of factors and you should know the morphology of the zone where the cities are to answer properly. For example there may be mountains in the east of Tehran and that would explain the late sunrise. I don't know the details but I think morphology of the earth is the answer. On a big scale you can say it's a sphere, locally it's everything but smooth.

> **Comments:**
> **username_1**: Standard sunrise and sunset calculations neglect terrain.  
> **username_2**: Really? I mean why is that? Why giving a precise time for sunrise and sunset if it is not accurate?  
> **username_1**: They do account for atmospheric refraction and the apparent width of the solar disk. Accounting for terrain would require computing different times for every hill or valley.  

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