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n. The point on the orbit of a celestial body that is farthest from the sun.

n. The point in the elliptical orbit of a planet, comet, etc., where it is farthest from the sun.

n. That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.

n. That point of a planet's or of a comet's orbit which is most distant from the sun: opposed to perihelion.

n. apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun

"In order for this result to be produced, the earth must reach that part of its orbit known as aphelion, where the distance from its controlling centre is greatest, so that the eccentricity of the moon's orbit is always an indication of the position of the earth in its relation to the sun."

perihelion   

apoapsis    point of apoapsis   

perihelion    apolune    perilune    apogee    apastron   

aphelia   

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