I'm pretty sure that for excel, you would need to enter =LOG(TAN(RADIANS(7)))
because the trig functions in excel work on radians rather than degrees. -Bill On Tue, Aug 9, 2022 at 1:50 AM 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 > >
--------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
