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Okay on reconsideration perhaps I did discount the latitude effect with increases in daylight hours further north too much. The four have almost the same longitude, but as we move north...There are two factors - time zone (and location within the time zone) & distance from the equator - that have a bearing on the timing of sunrise/sunset.
Latitude & longitude both have an effect.
Sharky pointed out the equator effect & you suggested he had been "overserved" ;-)
Edited to add:
Fargo, ND (46.9N, 96.8W) Civil Twilight = 9:26 CDT
Houston, TX (29.7N, 95.2W) Civil Twilight = 8:30 CDT
Almhttp://www.scubaboard.com/forums/newreply.php?do=newreply&p=5235831ost an hour difference & largely due to the latitude.
Cancun Today - Central 06:11 19:16 13:05
Birmingham Today - Central 05:50 19:38 13:48
Nashville Today - Central 05:44 19:43 13:59
Indianapolis Today - Eastern 06:34 20:49 14:15
So yeah, the further north you are this time of year, the earlier sunrise and later sunset on GMT for the same longitude due to the increase in daylight hours. The differences in time zones for the same longitude makes it a little complex.Birmingham Today - Central 05:50 19:38 13:48
Nashville Today - Central 05:44 19:43 13:59
Indianapolis Today - Eastern 06:34 20:49 14:15
The longitude is the bigger factor, but the latitude is in play.

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