What is the difference between a solstice and an equinox? Using three or more complete sentences, describe the reasons why these days are unique.

In simplest terms, an equinox represents a day with equal duration of day and night (Mar 21 and September 23) and thus we have a spring and a fall equinox. And solstice ... The movement of earth around the sun is the reason for equinox and solstice, and this motion is the reason for the occurrence of seasons on earth.

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