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Article #254Re: snarfy's assumption
From: Mike McCants
Date: Tue, 03 Nov 1992 16:45
Date: Tue, 03 Nov 1992 16:45
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1555 bytes
In article snarfy@cruzio.santa-cruz.ca.us writes: > >If you really find my reasoning defective or incoherent, I would like to know >just what it is you are having difficulty with. > snarfy Previous post: >The July 25th, 1969 issue of TIME magazine stated that the neutral >point was 43,495 miles from the center of the moon. Since this value is obviously wrong, the interesting question becomes "Where did this wrong value come from?" The correct value for Apollo 11 might be pretty close to 23,500. Could it simply be a typo? Another possible answer is an inverse distance cubed equation: Me/(Re**3) = Mm/(Rm**3) Using Rm = 43,500 miles and Me/Mm = 81.3 gives Re = 188,400 and Re + Rm = 231,900 miles. The ephem program gives a value of 231,500 miles for the lunar distance on July 24, 1969. Where was Apollo 11 on July 24? Coming back and reentering the Earth's "sphere of influence"? But the July 25th issue of Time had to go to press several days before that. Of course, for Apollo 11, this is actually a two-dimensional problem, not a one-dimensional problem.
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Path: arc1-ca.pugleaf.net!sparky!uunet!walter!bellcore!rutgers!ucla-cs!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!execu!mike From: mike@execu.execu.com (Mike McCants) Newsgroups: sci.space Subject: Re: snarfy's assumption Keywords: Lunar Neutral Point Calculation Message-ID: <4128@execu.execu.com> Date: 3 Nov 92 16:45:45 GMT References: <4583@cruzio.santa-cruz.ca.us> Distribution: usa Organization: Comshare, Inc. Austin Development Center Lines: 30