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Andrew:

If you are using a scientific calculator, there should be an "arc"
function button that will shift from calculating sine to calculating
arcsine.

If you have a computer with Excel (or equivalent), there is an arcsine
(and arctan) function available in the spreadsheet.

Finally, since arcsine(x) is simply "the angle whose sine is x" scanning
down a conventional table of sines will easily give you the answer to a
degree (and you could interpolate to an even finer value) which should
be enough for a sundial.

Lu Abel

Andrew Corl wrote:
> I am working on a personal project to design a sundial for my house.
> Yes I know this is not a sundial list.
>
>
>
> I need a formula for calculating arcsin and arctan.  I have gone on the
> web and searched a number of different places to look but have not found
> anything that really helps.  I am not looking for a long winded
> explination of why it works, but just this is what you do to get the answer.
>
>
>
> The one formula I have is:
>
>
>
> SH=arcsin(cos declination of wall * cos latitude)
>
>
>
> I have the declination of the wall and the latitude, but cannot
> calculate arcsin.
>
>
>
> I know that many of you are more into math than I ever hope to be so I
> decided to seek guidance from you.
>
>
>
> Thanks,
>
> Andrew
>
>
>

   

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