what causes our seasons on earth
The Tilt of the Earth's Axis and its Elliptical Orbit. We have all been taught that the seasons are caused by the 23.4Â° angular offset (obliquity) between the Earth's axis of rotation and a perpendicular to the Earth's orbital plane with the Sun (see obliquity below). The Earth's rotational axis stays nearly fixed in space, even as the Earth orbits the Sun once each year.