# Difference of sunset and sunrise of two cities are different

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?

• As the other answers note, the length of day varies because of latitude (how far north/south you are) and the time of sunrise/set vary due to longitude (how far east/west you are). Those factors combine to give the results above. – user21 Nov 26 '16 at 16:06

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.