May I please add that it feels so wrong that we are not taught this part of the cosmic ladder in school. This video - especially the concise yet insightful description of how the Martian orbit was found - is really inspiring. The quality of the work is incredible when you combine elegant math with the 3b1b/tao goodness.
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[ 2.8 ms ] story [ 18.0 ms ] threadTao’s oft given talk about the cosmic distance ladder has always been my favorite thing he has done.
https://m.youtube.com/watch?v=7ne0GArfeMs