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Detailed explanation-1: -The term “perihelion” refers to the point in the orbit of a planet or other astronomical body, at which it is closest to the sun. The word comes from Greek and literally means around (peri) the sun (helios).

Detailed explanation-2: -aphelion, in astronomy, the point in the orbit of a planet, comet, or other body most distant from the Sun. When Earth is at its aphelion in early July, it is about 4,800,000 km (3,000,000 miles) farther from the Sun than when at its perihelion in early January.

Detailed explanation-3: -The point at which a planet is closest to the sun is called perihelion. The farthest point is called aphelion.

Detailed explanation-4: -The perihelion, the point at which the comet’s orbit is closest to the Sun, is just 0,6 astronomical units (AU).

Detailed explanation-5: -Sungrazing comets are a special class of comets that come very close to the sun at their nearest approach, a point called perihelion. To be considered a sungrazer, a comet needs to get within about 850,000 miles from the sun at perihelion. Many come even closer, even to within a few thousand miles.