NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Basics of computing sunrise/sunset
From: Bill B
Date: 2009 Jun 27, 16:22 -0400
From: Bill B
Date: 2009 Jun 27, 16:22 -0400
Marcel Tschudin wrote:
> OK, I give it a try.
Thank you for your response. Your response goes a long way in answering my
questions. I feel I may have stated the question(s) poorly.
My understanding were the balloons were hypothetical ("imaginary") so
placement was not a problem.
More importantly, I was reacting to a string of balloons to the GP of the
setting sun (About 5400 nautical miles away).
> But in theory: Assume you know the athmospheric conditions to
> "the horizon" and beyond right up to GP of the sun, i.e. you are able to
> monitor these conditions for this entire stretch; say you have an imaginary
> string of weather balloons thousands of miles long.
That seemed unnecessary to me.
I wrote, "In my mental picture, I am not wrapping my vision along the
surface of the Earth. I have a line of sight from my eye position to the
Sun, which will run out of atmosphere *long* before 5400 nm or the 93
million miles to the Sun. Therefore I would want a series of hypothetical
weather balloons along my line of site."
Am I less obtuse now?
Thanks
Bill B.
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