How accurate is accurate?

[Solistics]

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?

 

[mgb_phys]

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