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How accurate is accurate?

  1. Apr 21, 2009 #1
    how accurate is accurate? Say if I have geocentric coordinates of the moon is 10 arc seconds a resonable accuraccy if someone wanted to send something to the moon?
  2. jcsd
  3. Apr 21, 2009 #2


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    An arc sec is 206265 of a radian (a useful number to learn)
    So 10" is roughly 1 in 20,000
    The moon is 350-400,000km away so 10" would be about 20km at the distance of the moon
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