please solve this riddle. 10pts to winner!?

the Sun rises, sets two different ways-

Only exactly each year on two days.

Otherwise, on the horizon it

Moves along- day by day, bit by bit.

Also changing is the length of night

And the Sun's height, affecting its light.

Its distance is *not* one of the reasons

That we exist. We are the... ?

Type your answer in the blank below, and click "Submit."
 
It has to be seasons because of the comment about not being distance and because it rhymes with reasons.
 
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