Because it tilts on its axis
the earths rotation
The repeating phenomena referred to as "day" and "night".
Day and night is caused by the rotation of the earth about its axis. Seasons are caused by the axial tilt of the earth
There is no point on the earths surface that experiences night for 24 hours every day.
rotation
Basically the tilt of the axisThe spinning of the Earth on its axis is the cause of day and night. it takes approximately 24 hours for any point on the earth to directly face the sun twice.A combination of the tilt of the Earths axis and its orbit around the sun is responsible for the seasons.
equinox
rotation
seasonsRotation around the sun gives the seasons because the earth is tilted. Rotation about earth's axis give day and night.
day and night
Just a guess but maybe day and night
Because of the earths tilt of 22.5 degrees