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--- Begin Message ---No rush; thank you. I appreciate you applying your brain to my concerns! > On Jul 20, 2024, at 12:11 PM, Steve Lelievre > <steve.lelievre.can...@gmail.com> wrote: > Oh, no! I think I may have my initial term for tan gamma inverted, so my > result would be an angle relative to EW. > > I have to go out for the day now, but will check my calculation when I get > home. > > Steve > > > > On 2024-07-20 8:50 a.m., Steve Lelievre wrote: >> >> On 2024-07-20 7:01 a.m., John Goodman via sundial wrote: >>> My ultimate objective is to find the sun's hour angle on a given day, in a >>> given location, when it reaches a selected azimuth. >> John, here's my attempt. I've never used this result so my calculation needs >> checking. >> >> Cheers, >> >> Steve >> >> >> >> δ is solar declination >> >> φ is latitude >> >> ω is hour angle >> >> γ is azimuth >> >> >> Solar position vector S is >>  >> so >>  >> Rearrange: >>  >> Above equation is of form: >>  >> Using trig identities: >>  where  and  >> in which case >>  >> or >>  >> or >>  >> >> We have to watch out for quadrant in inverse functions. >> > -- > https://www.gnomoni.ca <https://www.gnomoni.ca/> > https://www.youtube.com/@gnomonica > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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