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Date: Tue, 28 May 85 09:08:58 pdt
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Subject: Re:  sun(1)
Status: R

Alan, 

The best book I have seen to date is a small book called "Practical
Astronomy With Your Calculator" by Peter(?) Duffet-Smith.  I was able
to order a copy from a local bookstore.  The B. Dalton here said they
stock it, but they happened to have sold them all.

As far as the definition of sunset, there are lots of them. The program
uses the time when the upper limb of the sun descends below the horizon.
Note that it is calculated for the observer; a more accurate calculation
would include your mountains. Refraction causes a sun which is already
below the horizon to appear to be above.  

					Bob Bond


