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Dec 3, 2014 at 15:17 comment added DJohnM This Skylab video youtube.com/watch?v=S_p7LiyOUx0 illustrates the process. The concavity is measured with a bar laid along the direction the astronaut is running.
Dec 3, 2014 at 12:13 history edited RedGrittyBrick CC BY-SA 3.0
added 81 characters in body
Dec 3, 2014 at 12:08 history answered RedGrittyBrick CC BY-SA 3.0