Hello John,
Although it is not a formula, you can use the "swiss knife" software
TriSph to obtain the hour angle (and also the legal hour) with the
configuration "Position triangle". You can download TriSph here:
http://yvon.masse.perso.sfr.fr/trisph/index_en.htm
Best - Yvon
Le 01/02/2015 12:00, sundial-requ...@uni-koeln.de a écrit :
Message: 1
Date: Sat, 31 Jan 2015 10:05:46 -0500
From: John Goodman<johngood...@mac.com>
To: Sundial List<sundial@uni-koeln.de>
Subject: A question for the mathematically inclined
Message-ID:<37cd8a78-c1f4-470f-9292-a709038b9...@mac.com>
Content-Type: text/plain; charset=utf-8
Dear dialists,
Does anyone know a formula for calculating the hour angle given the azimuth,
declination, and latitude?
I?d like to know the time of day, throughout the year, when the sun will be
positioned at a particular angle. This will allow me to determine when sunshine
will stream squarely through a window on any (sunny) day.
I?ve seen several formulae for calculating azimuth. I suspect that one of them
could be rewritten to solve for the hour angle given the azimuth instead of the
finding the azimuth using the hour angle (plus the declination and latitude).
Unfortunately, I don?t have the math skills for this conversion.
Thanks for any suggestions.
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