The process of the Earth completing one rotation around the Sun is known as a revolution. This journey takes about 365.25 days, which defines the length of a year in the Gregorian calendar. The Earth's orbit is elliptical, meaning its distance from the Sun varies throughout the year, contributing to seasonal changes. The tilt of the Earth's axis also plays a crucial role in this process, resulting in varying sunlight and temperatures across different regions. This revolution, combined with axial tilt, creates the seasonal cycle that affects climate and weather patterns.