![]() OK, now with a smarter search, I found another. The biggest problem was that the thermometer was looking at a much bigger region than the wallet, so that any differences in its readings were just from the big temperature differences of things (rocks, pool. I found an amazingly amateurish video of a guy stumbling around in the dark trying to use an infrared thermometer on a wallet. (I've used the law that the absolute temperature only goes as the 1/4 power of the thermal radiation flux to get that even adding the focused moonlight to our ordinary radiant energy wouldn't get things very hot.) How hot would that surface temperature be? Since the moon is at about the same distance from the sun as us, and we are at the right temperature to emit about as much radiation as hits us from the sun, that means that the focused moonlight would only heat things up a little above ordinary room temperature. The important point is that the thermal radiation also heads off in all directions.) No passive device (such as a lens) could cause this thermal system to spontaneously heat up another system to a temperature higher than the surface temperature. (The spectrum would be different, but that's not very relevant for the heating power. Let's imagine that the moon's surface was hot enough to glow with the same energy intensity as we actually see in its reflected sunlight. ![]() That greatly limits the ability of any subsequent optical device (lens, mirror.) to refocus the light. They all rely on a key fact- that the moon scatters the sunlight that hits it into more or less random directions. There are several ways to make the argument. No Permit is required but PRIOR to burning but you must call the City of Albuquerque's Burn/No-Burn Hotline to ensure its a burn day.That's a very intriguing original question.
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