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08-05-2009, 20:44   #1
**Timbuk2**
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Sunrise/Sunset Times

My extreme apologies if this is the wrong forum. (I considered Weather or Physics, but I didn't think they were appropriate)

This site here lists the sunset/sunrise times for Dublin for each day
http://www.timeanddate.com/worldcloc...nomy.html?n=78

For example, today, the sunset time is listed as 21:07 and the sunrise time is listed as 05:37.

My question is: what actually happens at this time? What does this exact time mean? Surely you can't narrow a sunset down to one minute - isn't it not a gradual event.

Can anyone shed some light on this?
Thanks
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08-05-2009, 21:35   #2
Breaktown
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I think it's the point when the centre of the Suns disk crosses the horizon.
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08-05-2009, 23:25   #3
backboiler
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From the same web site.
http://www.timeanddate.com/worldcloc...nomy.html#rise
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09-05-2009, 13:30   #4
Beeker
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Quote:
Originally Posted by **Timbuk2** View Post
My extreme apologies if this is the wrong forum. (I considered Weather or Physics, but I didn't think they were appropriate)

This site here lists the sunset/sunrise times for Dublin for each day
http://www.timeanddate.com/worldcloc...nomy.html?n=78

For example, today, the sunset time is listed as 21:07 and the sunrise time is listed as 05:37.

My question is: what actually happens at this time? What does this exact time mean? Surely you can't narrow a sunset down to one minute - isn't it not a gradual event.

Can anyone shed some light on this?
Thanks
I may be wrong but my understanding is it is the time that the leading edge raises above the horizon for sunrise and when the trailing edge dips below the horizon for sunset. Dont forget that sunrise/set times will differ for different parts of the country. The further west you are the later the times will be.
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11-05-2009, 15:30   #5
994
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Quote:
Originally Posted by **Timbuk2** View Post
My extreme apologies if this is the wrong forum. (I considered Weather or Physics, but I didn't think they were appropriate)

This site here lists the sunset/sunrise times for Dublin for each day
http://www.timeanddate.com/worldcloc...nomy.html?n=78

For example, today, the sunset time is listed as 21:07 and the sunrise time is listed as 05:37.

My question is: what actually happens at this time? What does this exact time mean? Surely you can't narrow a sunset down to one minute - isn't it not a gradual event.

Can anyone shed some light on this?
Thanks
No, this is a common mistake. Dusk and dawn are the gradual events; sunrise is the moment that the leading edge of the sun becomes visible, sunset is the moment that the trailing edge vanishes.
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