The Tilt Of Earth's Axis Causes The Seasons Because -

Introduction Contrary to a common misconception, the seasons are not caused by Earth’s varying distance from the Sun. In fact, Earth is closest to the Sun (perihelion) in early January, yet the Northern Hemisphere experiences winter at that time. The true driver of seasonal change is the consistent 23.5-degree tilt of Earth’s axis relative to its orbital plane around the Sun.

Earth’s axis is an imaginary line running from the North Pole to the South Pole. As Earth orbits the Sun over 365 days, this axis always points in the same direction (toward the star Polaris, the North Star). Because of the 23.5° tilt, the Northern and Southern Hemispheres receive varying amounts of direct sunlight at different times of the year. the tilt of earth's axis causes the seasons because