However, the Earth's orientation changes throughout the year as it orbits the sun. During the Northern Hemisphere's summer solstice (around June 21st), the North Pole is tilted most directly towards the sun.
During the Northern Hemisphere's winter solstice (around December 21st), the North Pole is tilted most directly away from the sun.
It's important to remember that the Earth's axis itself doesn't change its direction. The tilt is constant, but our perspective of that tilt changes as the Earth orbits the sun.
