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Aphelion is a word used to describe the furthest that a planet gets from the sun during it's orbit, while perihelion is used to describe the closest that it gets.
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Aphelion
Mars is about 154 million miles (249 million kilometers) away from the sun at its aphelion, which is the farthest point in its orbit around the sun. This distance varies slightly due to Mars' elliptical orbit.
1.513325783 x 109 Km at aphelion
Mars is not far from there. The average of its perihelionand aphelion distances is 227,939,200 Km. (rounded)
A planet is slowest when it is farthest from the Sun in its elliptical orbit, at its aphelion point.
The orbital far point, or aphelion, is the point in an object's orbit around the sun where it is farthest away from the sun. This is in contrast to the perihelion, which is the point in the orbit where the object is closest to the sun.
The sun. Aphelion is the point in Earth's orbit where it is farthest from the sun.
It is possible for something to be so far away from the Sun that that thing and the Sun would not be aware of each others existence. But for a human being the furthest man can get from the Sun at the moment is to be on the ISS when it is on the dark side of the Earth at Aphelion. However, the astronauts on the Moon at Aphelion and Apogee would have been the furthest man has travelled (If that possibility existed because of the positions of the orbits)
Pluto's perihelion distance is about 4.4 billion kilometers, while its aphelion distance is about 7.4 billion kilometers from the Sun. So, Pluto is closer to the Sun at perihelion and farther away at aphelion.
Aphelion is the point in a planet's or comet's orbit where it is farthest from the Sun. The Earth's aphelion is 152,098,232 km.
The speed of a planet revolving around the Sun is slowest at the aphelion, which is the point in its orbit farthest from the Sun.