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xkcd #2882: Net Rotations
(imgs.xkcd.com)
Alt text:
For decades I've been working off the accumulated rotation from one long afternoon on a merry-go-round when I was eight.
I don't believe that to be correct, but I'm to stupid to refute you. So I'll take it as facts. Thank you for enlightening me.
It's because your return journey is closer to the axis of the earth so your action has less torque.