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My brain doesn't work in a way that lets me understand even how the Sun's diameter and mass was discovered, there's usually an explanation about triangles and projection on a wall, but you'd have to know the distance to the Sun, and that's pulled out of a hat as well. And how can you calculate the Sun's speed? Anyway, if someone knows of a web site that explains this stellar stuff I'd appreciate it. It reminds me of how explanations of electrical circuits fall apart after the analogy to water in a hose and resisters are spigots and presto here's a multi-phase circuit diagram!