Tilt Produces Seasons
q At present-day, the axis is tilted at an angle of 23.5°, referred to as
Earth’s “obliquity”, or “tilt”.
q The Sun moves back and forth through the year between 23.5°N and
23.5°S.
q Earth’s 23.5° tilt also defines the 66.5° latitude of the Artic and
Antarctic circles. No sunlight reaches latitudes higher than this in
winter day.
q The tilt produces seasons!!