an object circling an irrotational vortex does not itself rotate. zooming in, and cancelling the circling rotation, we see this is because the currents push it to rotate in the opposite directionpic.twitter.com/al9qWXHE9P
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https://twitter.com/matthen2/status/1251783589080924160?s=19 … Velocity is reciprocal of distance to centre
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