You'd probably find better information at a physics forum, such as Physics Stack Exchange
My understanding of lunar orbits is that the moon's orbit is elliptical, so there's a point where the moon is close to the earth and one when it's further away.
A quick look at Wikipedia
seems to back this, and even claims the moon is getting slowly further away from the Earth at a rate of 3.8cm/year.
A little more link clicking turns up the website for the Apache Point Observatory Lunar Laser-ranging Operation
(incidentally abbreviated APOLLO) which has some data measured by the program as well as a wealth of other data.