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The sun is blue-green (eclipse2017.nasa.gov)

submitted 1 year ago by kittenroar to c/space

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[–] Seathru 6 points 1 year ago (2 children)

Because though the sun emits strongest in the green part of the spectrum, it also emits strongly in all the visible colors – red through blue (400nm to 600nm). Our eyes which have three color cone cell receptors, report to the brain that each color receptor is completely saturated with significant colors being received at all visible wavelengths. Our brains then integrate these signals into a perceived white color.

If that was the case, wouldn't the moon appear more green?

[–] Muela@kbin.social 4 points 1 year ago

I guess the difference in colors is not as strong as in other artificial light sources. So it wouldn't be entirely blue, just "blueish than it seems". When measuring how true are colors under a certain light, a common measure is the CRI or color rendering index. The sun is taken as a 100CRI or perfect score reference. So maybe the article is a bit misleading

[–] Hotchpotch 3 points 1 year ago

I think ist depends on the reflected wavelengths.