That's because the sun's position at a certain time of day is different in different seasons.
(That; 's; because the sun's position at a certain time of day is different in different seasons) (the sun's position at a certain time of day; is; different in different seasons)
That the sun's position at a certain time of day
's is
because the sun's position at a certain time of day is different in different seasons
different in different seasons