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This is something I've wondered about. People keep talking about how it's blue light that keeps you awake, but moonlight is pretty bluish. Why would humans have
by Nition 8y ago
This is something I've wondered about. People keep talking about how it's blue light that keeps you awake, but moonlight is pretty bluish. Why would humans have evolved to have that as the don't sleep wavelength?
- tylerhou 8y agoMoonlight is white, just like how the sun is white. The moon = blue, sun = yellow connotations are mostly cultural.
- Nition 8y agoJust looked it up. Apparently it's due to the Purkinje Effect, i.e. "The tendency for the peak luminance sensitivity of the human eye to shift toward the blue end of the color spectrum at low illumination levels."
- perl4ever 8y agoI just googled it and apparently moonlight is actually redder (or yellower if you prefer) than sunlight. Here is a thread with a graph of the spectrum: https://physics.stackexchange.com/questions/244922/why-does-moonlight-have-a-lower-color-temperature/245275 https://physics.stackexchange.com/questions/244922/why-does-...