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Article #1990Re: Idiots in Astrophysics
From: Matthew Russotto
Date: Mon, 10 Sep 2001 17:30
Date: Mon, 10 Sep 2001 17:30
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2771 bytes
In article <3B9BA470.F5323246@clark.net>,
Tiny Human Ferret <klaatu@clark.net> wrote:
>Fabrikant wrote:
>>
>> She also claimed that right after the collision, the Earth spin was so
>> fast, that one revolution took 5 hours instead of 24. The moon was
>> originally much closer to Earth, and the distance is increasing by 3
>> cm. per year. The reporter, regretfully, did not know what question
>> to ask. Here are some questions, which I would like to ask. First,
>> how can she measure the distance between the Earth and the Moon with
>> the accuracy of 3 cm?
>
>Laser light reflection from some reflectors conveniently left up there for
>just this purpose about 30 years ago. Light travels at a known speed, time
>of flight calculations reveal distance. Same principle as radar, more or
>less.
Those who went to the University of Maryland, College Park, may
remember the laser on a building near the Computer Science Center,
which was often fired at the moon. If a print job never turned up,
perhaps it was sent to the "Moonwriter."
--
Matthew T. Russotto russotto@pond.com
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 101eb4,d3f53a6bda426904 X-Google-Attributes: gid101eb4,public X-Google-Thread: 10a12a,d3f53a6bda426904 X-Google-Attributes: gid10a12a,public X-Google-Thread: 10e835,d3f53a6bda426904 X-Google-Attributes: gid10e835,public X-Google-Thread: 101049,d3f53a6bda426904 X-Google-Attributes: gid101049,public X-Google-Thread: 103916,d3f53a6bda426904 X-Google-Attributes: gid103916,public X-Google-ArrivalTime: 2001-09-10 10:35:10 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!netnews.com!xfer02.netnews.com!newsfeed1.cidera.com!Cidera!sjcppf01.usenetserver.com!e420r-sjo4.usenetserver.com!usenetserver.com!e420r-atl2.usenetserver.com.POSTED!russotto Newsgroups: ny.general,dc.general,chi.general,tx.general,fl.general Subject: Re: Idiots in Astrophysics References: <7cffa2b0.0109090718.495d80d0@posting.google.com> <3B9BA470.F5323246@clark.net> Organization: DiS(L)organized From: russotto@wanda.pond.com (Matthew Russotto) Lines: 29 Message-ID: <yM6n7.502$Ku4.82019@e420r-atl2.usenetserver.com> X-Complaints-To: abuse@usenetserver.com X-Abuse-Info: Please be sure to forward a copy of ALL headers X-Abuse-Info: Otherwise we will be unable to process your complaint properly. NNTP-Posting-Date: Mon, 10 Sep 2001 13:30:06 EDT Date: Mon, 10 Sep 2001 17:30:06 GMT