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How does a perihelion differ from an aphelion?

Answer 1

Elena Antonova

The distance from its parent star.

The points a planet is closest to and furthest from its parent star are known as perihelion and aphelion, respectively.

For instance, Earth's aphelion is 152.1 million km from the Sun, while its perihelion is 147.1 million km.

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Answer 2

Christopher Ales

An object's closest point to the sun in its orbit is called its perihelion, and its furthest point from the sun is called its aphelion.

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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.