The term that describes the movement of Earth around the sun is called "revolution." Earth completes one full revolution around the sun approximately every 365.25 days, which defines the length of a year. This movement is elliptical, which means that Earth's distance from the sun varies slightly throughout the year. The tilt of Earth's axis causes seasonal changes as different parts of the planet receive varying amounts of sunlight during its revolution. This cycle of revolution, combined with axial tilt, is essential in shaping climate patterns, agricultural seasons, and natural phenomena worldwide.