I posted for hour angle. It is probable that the corrected equation should
read:
> From Jean Meeus's "Astronomical Algorithms," 1951, p. 89:
>
> tan H = sin A / (cos A * sin f + tan h * cos f) [corrected]
>
> where H is hour angle, A is azimuth, f is latitude and h is altitude,
> and H is obtained via the arctangent.
Gordon
Steve.
The equation in my edition of Meeus is as I gave it, but the repeated cos f
certainly does look suspicious since it would be a common factor. There is
a Second Edition, which I do not have, which may have a corrected equation.
His equation for tan A does have sin f and cos f factors in the
denominator, which is a hint that it may be incorrect.
Gordon
At 10:31 AM 12/14/00 -0400, you wrote:
Gordon, thanks for the message.
I would like to check whether there is a transcription error in your
message.
Does "cos f" really appear twice? I got information from Richard Koolish
which gave the answer in another form - as two equations. When I divided
them through to convert them to Meeus' form, there was a mismatch which
implies that the first cos f should perhaps be a sin f.
Thanks, Steve
Gordon Uber [EMAIL PROTECTED] San Diego, California USA
Webmaster: Clocks and Time: http://www.ubr.com/clocks
