sunrise algorithm alt correction
Trying to work out an excel spreadsheet that compensates sunrise sunset times for the effect of the observer's altitude.
I have Ed Williams Avformulary but that's for sea level... Any pointers? |
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hmmm, thanks for the link...the required altitude there seems to be teh altitude of the sun (-6deg for civil twilight etc) not the observer sitting in a plane or on top of a tall mountain.
is there any way of easily calculating it from say 16000 feet...i think I'll have to calculate the distance to horizon from height and go from there :confused: |
You doing you JAA etxernal ATPL course Stallie?
regards Sheep |
Nah sheep, actually its for calculating sun rise and sets for the summit of a 14000 foot active volcano in a very remote part of the world where we'll be doing some video and still photography of some ski-mountaineering next April.
It's also of academic interest to me as a pilot in the flight levels...and another little equation to play around with on long sectors. :D |
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Thanks Zeke! :ok:
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Hey Stallie, I've found this to be true just about everywhere... when the pics and videos come out too dark, it means they were taken at night... :O
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