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| | APOLLO |
 | | APOLLO measures the round-trip travel time of laser pulses bounced off the lunar retroreflectors to a precision of a few picoseconds, corresponding to about one millimeter of precision in range to the moon. |
 | | A total of four lunar retroreflectors are functional: three Apollo reflectors from Apollo 11, 14, and 15 (three times bigger than 11 and 14), and one French-built, Soviet landed (unmanned) unit from the Luna 21 mission. |
 | | APOLLO has benefited from the professional expertise of: Larry Carey, Peter Doherty, Erik Swanson, Sterling Fisher, Tim van Wechel, Allan Myers, Mark Klaene, Russell Owen, and Jeff Morgan. |
| physics.ucsd.edu /~tmurphy/apollo/apollo.html (961 words) |
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