Happy Friday Everyone! Since it’s turned out to be such a sunny day for the Portland area, our fun fact is about the source of our sunshine. Here’s some knowledge for you: The sun is not actually yellow, but has a more blue-ish tint to it! How so, you ask?
Photons of light from across the visible spectrum reach the Earth’s atmosphere. But more energetic (and shorter wavelength) photons are scattered away by particles in the atmosphere. So we don’t see blue and violet colors from the Sun as they’re scattered across the sky.
(This is also why the sky is blue, by the way.)
Particles with longer wavelengths, yellow, orange and red (the longest) have a better chance of making it through the atmosphere without being scattered. For most of the day the Sun’s light is passing through enough of the atmosphere such that the yellow region of the spectrum is most represented.
However, at midday, the Sun’s photos are going through the least amount of atmosphere, so it has a slightly blueish tint. And at sunset, of course, its photons are traveling through the maximum amount of atmosphere relative to your eyes, so only the reddish photons make it through.
Have an Excellent Weekend!