How accurate is accurate?

  • Thread starter Solistics
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  • #1
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Main Question or Discussion Point

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?
 

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  • #2
mgb_phys
Science Advisor
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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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