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As Neil pointed out, there is no absolute frame of reference, so I'll pretend that the frame of reference is relative to something - in some scenarios, the Sun; in others, the Earth, and in others,...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:38Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/1465 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/