Not exactly. Actually it's on the opposite side of the Earth relative to the Sun. So the 3 are always on one line but it has nothing to do with the position of the Moon. (Maybe you thought it was at the L2 of Earth-Moon system?)
Re:James Webb is fully deployed
by colechristensen on Sunday January 09, 2022 @12:55PM
(#29865660)
Oof, I knew that. JWST is at the earth-sun L2, that fact just didn’t enter my mind trying to figure out how far away it was.
Maybe when we have active bases on the moon or Mars would a rendezvous with L2 be feasible but not before. Hubble is in low earth orbit and far more accessible.