Path: utzoo!utgpu!water!watmath!clyde!rutgers!rochester!bbn!uwmcsd1!ig!agate!ucbvax!DOCKMASTER.ARPA!MSchwartz
From: MSchwartz@DOCKMASTER.ARPA
Newsgroups: comp.sys.zenith.z100
Subject: Re: sunrise-sunset
Message-ID: <880214053356.507578@DOCKMASTER.ARPA>
Date: 14 Feb 88 05:33:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 22

Don et al:
  All good sunrise/sunset programs I've seen are based on algorithms
published by the Naval Observatory in a book called "Almanac for
Computers".  Dan Goldish (at Raytheon) did one up in FORTRAN, and still
gets requests for printouts from a number of places each year.  His
implementation provides both astronomical and religious data.

  Some years ago, I converted his basic program to C, and placed it in
the public domain (via USENET, so it certainly got lost....).  With the
exception on 2 parameters (which I understand have been updated in about
1985) the program should be suitable.  Accuracy is about 1 minute at
40N; it is supposedly more accurate at the equator, and much less at the
poles.

  Please send net mail requests (for source code).  If I get more than a
few requests, I will find out if SIMTEL20 wishes to make it publicly
available.  I can only send EXEs through USNail, if required, since
MULTICS does not seem to talk nicely to TOPS20, UNIX, etc.

  If this is what you want, I'll be happy to help.

mike schwartz