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What is the difference between a perihelion and a aphelion?

Answer 1

The distance from the sun.

The terms aphelion and perihelion refer to the planet's distance from its parent star, respectively; for instance, the Earth is 152.1 million km from the Sun in early July and 147.1 million km from the Sun in early January when it is at perihelion.

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Answer 2

Luke Allen

Perihelion and aphelion refer to the position of a planet relative to it's parent star.

When the planet in it's orbit is at the position closest to it's parent star it is said to be at the perihelion .
When the planet in it's orbit is at the position farthest to it's parent star it is said to be at the aphelion .

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Answer 3

Layla Anderson

The points on an orbit around the Sun known as perihelion and apohelion, respectively, indicate the orbiting body's closest and furthest points from the Sun.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.