4 Seasons

The summer solstice
–first day of summer
–the longest day of the year
–North Pole is leaning more directly toward the sun
–Northern Hemisphere is warmed by more direct sunlight and days are long and hot.

The winter solstice
–the first day of winter
–the shortest day of the year
–North Pole is leaning away from the sun
–Northern Hemisphere receives only indirect sunlight; that is why winter is so much colder than summer.

The autumnal equinox is the first day of autumn and occurs when the North Pole begins to lean away from the sun.

The vernal equinox is the first day of spring and occurs when the North Pole begins to lean toward the sun again.