Earth's orbit refers to the path that our planet takes as it travels around the Sun. This journey takes about 365.25 days to complete, which is why we have a year divided into 365 days, with an extra day added every four years for a leap year. Earth's orbit is not a perfect circle; instead, it is slightly elliptical, meaning it is a bit stretched out. As Earth moves along its orbit, it also spins on its axis, which is tilted at an angle of about 23.5 degrees. This tilt is responsible for the changing seasons, as different parts of the planet receive varying amounts of sunlight throughout the year.