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True North in One Sentence (again)

 To: True North in One Sentence (again) dnorris@k7no.com (Dean Norris) Tue, 07 Jan 1997 07:38:52 -0700
 ```At 06:53 1/7/97 -0800, you wrote: > > >"At the time (local) half way between local sunrise and local sunset, >the Sun, if shining, will cast a shadow exactly (true) North-South." > >That's the sentence. > >Now, to avoid the FLAMES I received last time: No, I do not mention >NOON and this has nothing at all to do with noon, anywhere. Yes, this >works in the Southern Hemisphere, the shadow will fall to the South, >however. Yes, this works in Alaska (when the sun is out). Yes, if you >live in Death Valley or behind a hill, you won't be able to use this. >And finally, no, it will not work on the Moon, and it will be difficult >on/near the Earth's Equator. > >Example: > >local sunrise = 0700 >local sunset = 1720 > >The sun will cast a shadow N-S at exactly: {(1720-0700)/2} + 0700 = >1020/2 + 0700 = >510 + 0700 = 1210 local time! > >Just use the local weather forcaster's sunrise/sunset times and it's >accurate for amateur antenna alignment for sure! > >73! > >Bill, N3RR Bill, I live in a location where the takeoff angle to horizon to the east is virtually zero degrees, in other words, straight out. To the west the horizon is blocked by tall mountains and the takeoff angle is probably 20 degrees. Will this make a difference to the sunrise and sunset times.? Don't flatlanders have it easy! C. Dean Norris, K7NO e-mail to dnorris@k7no.com Have you hugged your criminal defense attorney today? -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: K7LXC@contesting.com Sponsored by Akorn Access, Inc & KM9P ```
 Current Thread True North in One Sentence (again), Dean Norris <= True North in One Sentence (again), Bill Hider True North in One Sentence (again), John Brosnahan True North in One Sentence (again), Bill Coleman AA4LR True North in One Sentence (again), Chad Kurszewski WE9V True North in One Sentence (again), Jay Terleski