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   There are plenty of zigzags that fit, but also at least that one straight.

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  Hi, didn't expect to see you here. Let's look at static differences first. Absolute gravitational potential itself is impossible to measure, since all frames of reference act the same. But we can easily measure differences of potential using accurate clocks. This works well on the surface of earth in reference to outer space for example. When measuring underground, we can also measure the accceleration along the path when walking there, since the acceleration is caused by the gradie...