"Technician" <
[email protected]> schrieb im Newsbeitrag
news:[email protected]...
> So you are telling me i am wrong, when you live many hundreds of miles away?
Thousands of miles away actually...
>Take note that you have no idea of any other factors involved. My claim was based on direct
>observation. there is no science, or math required, except that i glanced at my watch (that is kept
>up to date with my computer, that is also kept up to date with an atomic time server).
Whoaaa Travis, I was only talking about sunset. As in when the sun dips below the horizon. This is
deterministic. The length of the day is determined by your latutude and date. Now if time zones were
not a factor, the sun would be at it's highest point (transit) at 12:00PM (mid-day).
This can be calculated at:
http://aa.usno.navy.mil/cgi-bin/aa_pap.pl
Farmington, Franklin County, Maine (longitude W70.1, latitude N44.7): Begin civil twilight 4:18 a.m.
Sunrise 4:55 a.m. Sun transit 12:41 p.m. Sunset 8:27 p.m. End civil twilight 9:04 p.m.
Potsdam, St. Lawrence County, New York (longitude W75.0, latitude N44.7): Begin civil twilight 4:37
a.m. Sunrise 5:14 a.m. Sun transit 1:00 p.m. Sunset 8:47 p.m. End civil twilight 9:24 p.m.
Potsdam is at exactly the same latitude as Farmington and the length of the day is the same, but
Potsdam sits 5° west in the same time zone. So everything in Potsdam lags Farmington by 20
minutes. Now how much light pollution is in a certain place is a different story. ;-) (Potsdam
aslo has dark skies)
BTW- for where I live right now Rauenberg-Rotenberg, Germany (longitude E8.7, latitude N49.3): Begin
civil twilight 04:36 Sunrise 05:19 Sun transit 13:25 Sunset 21:32 End civil twilight 22:15
The length of my day is only about 40 min longer, but because the CET timezone is enormous,
encompasing most of western Europe, I sit quite far west in it. I have a sun transit of 1:35PM,
which gives me quite a bit of extra evening sun.
-Dave