Which gravitational pull has the greatest effect on tides?

The pull of the Moon's gravity on Earth is the primarily cause of tides and the pull of the Sun's gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon's pull is about twice that of the Sun's.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000