Physics
The term ''equinox' means

The axis of the Earth around which it rotates
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 path which the Earthtakes around the Sun

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Physics
Stars twinkle because

the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.
the distance of the stars from the earth changes with time.
None of these

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