[BerntR]

Actually, earth gravity could make a difference here. It is constantly pulling the club towards the ground and may support a gradual plane shift - or actually a spiral-like plane where an uncompensated single plane stroke is combined with a constant, vertical force.

It would be interesting to sort out whether the educated hands know where the ball is in gravity-less conditions. Surely there must be a golfing astronaut who could find out for us?

Gee - this plane stuff seems really complicated when you dive into the details.