The presence of the log seems weird in this context. Perhaps a photo of the relevant page would help. (I don't have the book handy.)
-- Jan On Mon, Aug 8, 2022 at 10:50 PM Bryan Mumford <br...@bmumford.com> wrote: > I’m working from Albert Waugh’s book “Sun dials, Their Theory and > Construction”. On page 45 he presents a method for computing hour lines. I > lack significant math skills, but I know how to work Excel. I don’t > understand how he is calculating these values. > > He says, for example, that “log tan t” of 7°30’ is 9.11943. > > In my simple-minded way I asked Excel to show me log(tan(7)) and got a > very different value. > I tried converting 7°30’ to radians and that didn’t get any closer. > > How can I calculate "log tan t" or "log sin latitude” with Excel to get > the values he shows? > > I anticipate further problems with the last two columns, but you have to > start somewhere…. > > - Bryan > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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