Ultraviolet rays intensity? Morning or noon? Any physicists here?
Hello, Not sure if this is hte place for this question. Since you all gardeners spend a lot of time outside in the sun, thought someone here might be able to answer the question.
Many years ago, in Hawaii, i walked the beach in late evening with sun very low in the horizon, less than 30 minutes. Next day I as peeling. Since then I have this impression that evening sun has lot more ultraviolet than noon sun. I understand the reflection of sun from the water.
However, recently I bought a pair of glasses that have the changing color lenses, darken as they exposed to ultraviolet. I notice that they get much much darker in the early morning or evening even when the sun is not directly shining on the lenses compared to rest of the day when sun even directly shining on the lenses does not darken them as much.
Any one has any ideas? Thanks.