Seasons
 The earth travels around the sun once a year.
 The earth’s axis is tilted relative to the plane of the
earth’s orbit around the sun.
Over the course of the year:
1. Day length changes
2. The angle that the sunlight hits the ground changes
As a result, we get more or less solar energy per day at
different times of the year. In the far Northern Hemisphere,
we get the most energy on June 21 (summer solstice) and
the least on December 21 (winter solstice). The opposite is
true for the far Southern Hemisphere.
Since things take a while to heat up and cool down, our
hottest weather follows the summer solstice, and our
coldest weather follows the winter solstice.
The major misconception is that we have summer when we
are closest to the sun. We are actually closest to the sun in
our winter in the US.