Perihelion and aphelion

The perihelion is the point in the orbit of a celestial body where it is nearest to its orbital focus, generally a star. It is the opposite of aphelion, which is the point in the orbit where the celestial body is farthest from its focus.

The word "perihelion" stems from the Ancient Greek words "peri", meaning "around" or "surrounding", and "helios", meaning "the Sun". "Aphelion" derives from the preposition "apo", meaning "away, off, apart". (The similar words "perigee" and "apogee" refer to the nearest and furthest points in some object's orbit around the Earth.)

According to Kepler's first law of planetary motion, all planets, comets, and asteroids in the Solar System have approximately elliptical orbits around the Sun. (It is only approximate because the ellipse the body traces in any single orbit does not end exactly where it begins, due to precession.) Hence, an orbiting body has a closest and a farthest point from its parent object, that is, a perihelion and an aphelion. Each extreme is known as an apsis. Orbital eccentricity measures the flatness (departure from a perfect circle) of the orbit.

The perihelion and aphelion are the nearest and farthest points (apsides) of a body's direct orbit around the Sun.

Application to Earth

Earth is about 147.1 million kilometers (91.4 million miles) from the Sun at perihelion around January 3, in contrast to about 152.1 million kilometers (94.5 million miles) at aphelion around July 4 — a difference of about 5.0 million kilometers (3.1 million miles). (These dates change over time due to precession and other orbital factors, which follow cyclical patterns known as Milankovitch cycles. For a table of these dates for various years, see Apsis.)



See also

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