C++ really has three macro systems: C macros for strcat metaprogramming, C++ templates for constrained hygienic memoized metaprogramming, and overloaded functions for type voodoo metaprogramming arising from the lack of confluence among types and values.
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Sure, but it seems to be too diffused for the magnifying glass trick to work with moonlight. I'm sure it's been tried and if it worked we would have YouTube videos of it by now.
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I found a random dude online claiming the moon is 1/500,000 as bright as the sun. About 10cm^2 Magnifying glass is needed to burn things with sunlight. So for moonlight we’d need 5,000,000cm^2 or 500m^2. A ~25m diameter magnifying glass.
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The key word there is *diffuse*. If the Moon were a giant mirror, sure you could use it in part of an optical system to reach solar temperatures... as long as you were IN the path of the reflected sunlight, which you would very rarely be.
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Optically, there's no distinction between the blackbody radiation emitted by an object, and diffuse reflected light. They're both light emitted in all directions of a given intensity.
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