GNSS clock error oscillates between apogee and perigee
https://youtu.be/aKwJayXTZUs
Gravitational red shift
They have 1000 days of data. They were disappointed to find general relativity.
They're going to put a cesium clock in the ISS.
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I'm just a guy who was told about flat earth, looked into it, and decided after a lot of thought that it's a ball. This site is a catalog of all the topics I looked into.