No, I meant what I wrote. The tilde indicates 2 approximations : a.. the unknown location of the reflector on the moon b.. your reduction of the moon-earth distance to 1.000 light-second. RB ----- [Robert Bennett] Yes, If NASA could see and aim the laser directly at the reflector, the beam would miss the Moon by ~ 30 km. Yes, you mean of course miss the reflector, not the moon, coz the moons bigger. And if they hit the reflector, theyd miss the reflection by 30 km.. Philip.