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Old 04-20-2014, 06:09 PM
 
4,658 posts, read 3,660,811 times
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Quote:
Originally Posted by bronski View Post
Not a good idea. Don't be like China. The east will have very early sunrise and sunset.
Also the west will have very late sunrise and sunset, nearly 8 am/pm

 
Old 04-20-2014, 06:10 PM
 
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Quote:
Originally Posted by Mac15 View Post
Yes there should be a unification. There are two many timezones in the world.
But our extreme longitudes will have big deviation from the "natural time"
 
Old 04-20-2014, 06:36 PM
 
Location: Bremerhaven, NW Germany
2,714 posts, read 3,046,417 times
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21st April

Astronomical Dawn: 03:46
Nautical Dawn: 04:45
Civil Dawn: 05:34
Sunrise: 06:12
Solar Noon: 13:25
Sunset: 20:37
Civil Dusk: 21:16
Nautical Dusk: 22:05
Astronomical Dusk: 23:05
Max sun angle: 48.3°

Only about 4 1/2 hours left of a "true night" and in about 3 1/2 weeks, astronomical twilight will last the entire night. Lowest sun angle at night is now about 25 degrees below the horizon.
 
Old 04-21-2014, 06:19 AM
 
Location: North West Northern Ireland.
20,633 posts, read 23,890,394 times
Reputation: 3107
6:11
8:44
 
Old 04-21-2014, 06:36 AM
 
4,658 posts, read 3,660,811 times
Reputation: 1345
Quote:
Originally Posted by The East Frisian View Post
21st April

Astronomical Dawn: 03:46
Nautical Dawn: 04:45
Civil Dawn: 05:34
Sunrise: 06:12
Solar Noon: 13:25
Sunset: 20:37
Civil Dusk: 21:16
Nautical Dusk: 22:05
Astronomical Dusk: 23:05
Max sun angle: 48.3°

Only about 4 1/2 hours left of a "true night" and in about 3 1/2 weeks, astronomical twilight will last the entire night. Lowest sun angle at night is now about 25 degrees below the horizon.
Also your sunrise will be the same as mines tomorrow
 
Old 04-21-2014, 06:39 AM
 
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Reputation: 1345
I just looked at the sky at dusk and the visible twilight lasted until 1-2 minutes after the nautical dusk (about 12.3 - 12.4 deg. below horizon), even with the sky started to being cloudy (lightning also!!!)
Maybe in the clear sky visible twilight can lasts until 13-14 deg. below horizon
 
Old 04-21-2014, 06:45 AM
 
Location: North West Northern Ireland.
20,633 posts, read 23,890,394 times
Reputation: 3107
Idk...

All I know is that the civil twilight times are wrong for here because its always brighter for much longer... Like yesterday it was broad daylight to about 9:15 and it was twilight to about 10:15... So it is wrong...
 
Old 04-21-2014, 07:02 AM
 
Location: Bremerhaven, NW Germany
2,714 posts, read 3,046,417 times
Reputation: 934
Quote:
Originally Posted by divisionbyzero0 View Post
I just looked at the sky at dusk and the visible twilight lasted until 1-2 minutes after the nautical dusk (about 12.3 - 12.4 deg. below horizon), even with the sky started to being cloudy (lightning also!!!)
Maybe in the clear sky visible twilight can lasts until 13-14 deg. below horizon
From my experience with a clear sky you can see visible twilight until the sun is about 13-14° degrees in the suburban city areas and about 15-16° in the more rural parts where is less light and less polution.

The sun does not go below 13° degrees at night during summer solstice and not below 15° degrees from Late May to Late July and while the twilight is clearly visible here throughout the night with a clear or only slightly cloudy sky around summer solstice, it is harder to see the twilight at the darkest hours in Late May or Mid/late July even with clear skies.

I live on the borderline between the central and the suburban parts of town, but the view at the northern horizon is free so i can see the twilight quite well from my apartment during the night hours around summer solstice.

It's different once you are driving out of town in the rural areas where is less light, here you can also see the twilight on a few more days despite being on the same latitude as in the city.
 
Old 04-21-2014, 07:34 AM
 
Location: North West Northern Ireland.
20,633 posts, read 23,890,394 times
Reputation: 3107
The sun only goes 10 below here but its still dark enough that you can't walk
 
Old 04-21-2014, 07:45 AM
 
Location: New York
11,326 posts, read 20,342,651 times
Reputation: 6231
Sunrise: 6:07 AM
Sunset: 7:41 PM

Max Sun Angle: 61.3°
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