Why Earth’s Distance From the Sun Keeps Changing #AstronomicalUnit #SunEarth #NASA #SpaceScience #OrbitFacts Earth doesn’t orbit the Sun in a perfect circle. Its elliptical orbit causes our distance from the Sun to change throughout the year—proving seasons aren’t caused by distance, but by Earth’s tilt. #NASA #SunFacts #AstronomyEducation #ScienceShorts earth sun distance, astronomical unit explained, elliptical orbit, seasons explained NASA | Galaxies Uncharted