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From: kissell@flairvax.UUCP (Kevin D. Kissell)
Newsgroups: net.followup
Subject: Re: An oldie revisited
Message-ID: <333@flairvax.UUCP>
Date: Fri, 17-Feb-84 15:13:08 EST
Article-I.D.: flairvax.333
Posted: Fri Feb 17 15:13:08 1984
Date-Received: Sat, 18-Feb-84 04:21:52 EST
Organization: Fairchild AI Lab, Palo Alto, CA
Lines: 15

(Sigh)
When the moon is on the horizon, its image passes through more of the
atmosphere than when it is overhead.  This *can* affect the size (and
shape) of the image slightly.  The usual effect (or so an astronomer
once told me) is that the image of the moon is *smaller* on the
horizon than overhead.  Next time you want to try an experiment,
instead of looking at the moon on the horizon and "imagining what it
would look like overhead", take photographs with a fixed focal-length
lens of the moon both on the horizon and overhead, preferrably on the
same night.  Then measure the resulting images. 

		Kevin D. Kissell
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