How Far Away Is the Moon? *
AbstractLet's suppose you can take advantage of the Internet and get a 'pen pal' located a 1000 miles away in another city. On the same night, and at EXACTLY the same time 'Universal Time', make a CAREFUL observation of where the Moon is located with respect to the background stars. You should be able to discern a slight (about 1/2 the Moon's diameter) shift in position due to parallax. Then, with a little geometry, you could estimate the distance of the Moon during the full lunar cycle (Odenwald, 1997). For another method of measuring the distance to the Moon, see Why Does the Moon Appear Larger at Some Times?
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Last edit date: 2018-03-23
BibliographyOdenwald, S., 1997. "Questions and Answers." Ask the Astronomer, Astronomy Cafe website. Retrieved March 6, 2018, from http://www.astronomycafe.net/qadir/q2077.html.
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