2 ms·
For more: http://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiment http://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiment
by mturmon 15y ago
For more:
http://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiment http://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiment