Physics
The term ''equinox' means

When the day and night are of equal duration
The axis of the Earth around which it rotates
The path which the Earthtakes around the Sun
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

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
Infrared radiations from sun burn our retina
Ultraviolet radiations from Sun burn our retina
All radiations from sun initiate chemical reactions in eyes

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