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From: @S1-A.ARPA,@MIT-MC.ARPA:Houser.DODCSC@MIT-MULTICS.ARPA
Newsgroups: net.space
Subject: Tropics
Message-ID: <2803@mordor.UUCP>
Date: Thu, 25-Jul-85 10:44:42 EDT
Article-I.D.: mordor.2803
Posted: Thu Jul 25 10:44:42 1985
Date-Received: Sat, 27-Jul-85 01:19:03 EDT
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Organization: S-1 Project, LLNL
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From: Houser@MIT-MULTICS.ARPA


          A book I was reading recently mentioned  that  over  time  the
angle  of  the plane of the ecliptic changes.  The consequence is that
the latitude of the tropics also move.  While this  makes  sense,  the
book  also  stated that there is no formula which describes the motion
over  time.  Is  this  really  true?  The  context  was  that  certain
archeological  sites  are  solstice  oriented  and could be accurately
dated if it was known in what year a Tropic was at  X  latitude.  Just
curious.

                                        jim@tycho