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Chinese biz baron wants to shove his artificial moon where the sun doesn't shine – literally

Farry

This is complete utter nonsense. A quick back-of-envelop calculation: The sun has an angular diameter of 0.0093 radians, so "focusing" the sun's rays from a distance is optically impossible, meaning that a plane mirror would be brightest. So from geosynchronous orbit, a distance of 35786km, the light would spread over 333km. For it to be 8x brighter than the moon, it needs to be 1/50000 of the brightness of the sun, so the mirror would have to be 1.4km in diameter. Riiiight...

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