Aphelion vs Perihelion

We know from Kepler's Laws of Planetary Motion that all planets in the Solar System execute elliptical orbits, with the Sun at one focus of each planet's orbit.Unless a planet's orbital eccentricity is zero, the planet will have a closest and farthest point. The closest point is the perihelion, and the farthest point is the aphelion.Click here to see an animation of a planet's orbit, with the perihelion and aphelion indicated thereon.The Earth's aphelion and perihelion dates are not the same as the Solstice Days. Earth's aphelion day is about 2 weeks after the Winter Solstice Day, and Earth's perihelion day occurs about 2 weeks after the Summer Solstice. The terms aphelion and perihelion should not be confused with the terms apogee and perigee, which refer to the farthest and closest point on the Moon's orbit around the Earth. See here for more information on these terms and their dates.