1) The Earth rotates on its axis and revolves around the Sun, causing day and night and the changing of seasons between hemispheres. 2) The Earth's axis is tilted at an angle of 23.5 degrees, which may have been caused by a large impact in the past. 3) As the Earth revolves around the Sun over the course of a year in its orbit, it takes 365.25 days to complete one full revolution.