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Article #254

Re: snarfy's assumption

#254
From: Mike McCants
Date: Tue, 03 Nov 1992 16:45
30 lines
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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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References: <4583@cruzio.santa-cruz.ca.us>

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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
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