My curious kids asked me this on the way to school and I honestly can’t answer it. Tried googling it but I keep getting the unit of measure as an answer rather than the method.
In: Planetary Science
if you look at something from 2 different places, and record and you know how far apart those 2 places are, you know the distance from each to the object. simple triangle
once you know how far away something is, you can make another triangle using that distance, and the angular size of the object in question. then the other side of the triangle is the diameter of the object
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