Aphelion
.svg)
The aphelion is the point in the orbit of an object where it is farthest from the Sun. The point in the orbit where an object is nearest to the sun is called the perihelion. The word aphelion derives from the Greek words, apo meaning away, off, apart and Helios. It's an apoapsis of a body in the Solar System.
The Earth's orbit has its aphelion around 25th June or July the third, at which it is approximately 152.1 million kilometers or 94.5 million miles from the Sun. Due to the workings of the Gregorian calendar, it may be a day or two earlier or later.
This path's shape varies due to the gravitational influences of other planetary objects, particularly the Moon. Approximately every 100,000 years, the Earth's orbital path changes from being nearly circular to elliptical. The difference of the Earth’s orbital shape from a perfect circle is known as its eccentricity. An eccentricity value of 0 is a circular orbit, while values between 0 and 1 describe an elliptical orbit.
+{{{1}}}−{{{2}}}
Aphelion Media
The apsides refer to the farthest (2) and nearest (3) points reached by an orbiting planetary body (2 and 3) with respect to a primary, or host, body (1)
The two-body system of interacting elliptic orbits: The smaller, satellite body (blue) orbits the primary body (yellow); both are in elliptic orbits around their common center of mass (or barycenter), (red +). ∗Periapsis and apoapsis as distances: the smallest and largest distances between the orbiter and its host body.
Keplerian orbital elements: point G, the nearest point of approach of an orbiting body, is the pericenter (also periapsis) of an orbit; point H, the farthest point of the orbiting body, is the apocenter (also apoapsis) of the orbit; and the red line between them is the line of apsides.
The perihelion (green) and aphelion (orange) points of the inner planets of the Solar System
The perihelion (green) and aphelion (orange) points of the outer planets of the Solar System
_mul.svg)
