Physics
The term ''equinox' means

When the day and night are of equal duration
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The axis of the Earth around which it rotates
The path which the Earthtakes around the Sun

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Physics
The sky appears blue because

It is actually blue
In white light, the blue component dominates
All colours interfere to produce blue
The atmosphere scatters blue colour more than the others

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