Perihelion refers to the point nearest the sun in the orbit of a planet or other celestial body.

A story told by a hologram of Doctor Stephen Hawking referred to the perihelion of Mercury. (TNG: "Descent")

The perihelion of planets in the Chin'toka system was listed in a computer graphic display viewed by Benjamin Sisko. (DS9: "Tears of the Prophets")

The graphic reads: "perihelion 107 km".

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