The Physics To Go website will be unavailable Friday evening through Saturday afternoon as electrical work occurs in the American Center of Physics server room. Down time will begin at 6PM Eastern Time on Friday. Service is expected to resume by 6PM on Saturday, July 30.
Visit this NASA website for a 25-year retrospective on how astronomers have used corner reflectors on the moon to learn about its position, its motion, and even its interior. The site describes how these measurements are made and what has been discovered. Also, you'll find a a photo of a retroreflector on the moon.
%0 Electronic Source %D July 11, 2005 %T Measuring the Moon's Distance %I Goddard Space Flight Center %V 2016 %N 28 July 2016 %8 July 11, 2005 %9 text/html %U http://eclipse.gsfc.nasa.gov/SEhelp/ApolloLaser.html
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