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When does summer start and other summer facts you should know.
The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
To be able to see a full circle rainbow you need to be able to see water droplets below your observable horizon - if you are standing on top of a tall building or looking out of an aircraft then you may have water droplets and sun
You can’t see UV but its damaging effects can stay with you for life. In fact, eyes are 10 times more sensitive to UV than skin.
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