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Originally Posted by Cevlakohn
Yeah, all that's pretty much covered in the chapter, but I still don't know whether it's safe to look at the sun (that is, stare at it for extended periods) when it's right above the horizon, and, very dim.
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I presume the "non-visible wavelengths that damage the eye" referred to are ultraviolet wavelengths, which can cause snowblindness, cataracts and retinal damage. They're even more strongly scattered by the atmosphere than blue and violet wavelengths, so by the time the sun is sitting on the horizon looking yellow or red, the direct UV component is very small indeed.
Grant Hutchison