Originally Posted by vive le beau jeu !
Mr.DL explained it well.
you've got a kinda intermediary example with mercury, which is not tidally locked with the sun, but has instead a 3:2 spin-orbit resonance with the sun (rotates 3 times around its axis while making 2 revolutions around the sun... the mercurial day being longer than the mercurial year).
another interesting example is pluto-charon which are always "face-to-face" (both tidally locked to each other).
but i'm afraid that might be a bit too much of information in a short time for the OP...
another funny thing in the flat earth stuff is what they say about satellites:
now if someone still has this "not sure if serious"
Thanks, pretty interesting! Things to think about while tennis is on hold