qAt
present-day, the axis is tilted at an angle of 23.5°,
referred to as Earth’s “obliquity”, or “tilt”.
qThe
Sun moves back and forth through the year between 23.5°N and
23.5°S.
qEarth’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.
qThe
tilt produces seasons!!