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Path: utzoo!watmath!clyde!burl!ulysses!harpo!decvax!wivax!mckeeman
From: mckeeman@wivax.UUCP
Newsgroups: net.astro
Subject: sunrise, sunset
Message-ID: <19470@wivax.UUCP>
Date: Wed, 2-May-84 13:30:14 EDT
Article-I.D.: wivax.19470
Posted: Wed May  2 13:30:14 1984
Date-Received: Fri, 4-May-84 00:48:20 EDT
Sender: mckeeman@wivax.UUCP
Organization: Wang Institute, Tyngsboro, Ma.  01879
Lines: 8

Can someone give me a pointer to a simple formula for
sunrise(Lat, Long) and sunset(Lat,Long)?

I don't need great accuracy.  I have been using

sr = 6.0 + 1.5*sin(date-Sept21) + (Long-75)/15

for latitute 40.  A small improvement will help.