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Earth

The terminator of day and night on Earth approximately 500 miles east of the North American continent

A terminator was the visible dividing line upon a planet's surface that separated day and night.

Commander Sulu stated that the HMS Bounty was crossing the terminator into night on approach to San Francisco, Earth during their visit to the 20th century. (Star Trek IV: The Voyage Home)

Lieutenant junior grade Worf gave the latitude and longitude of Paul Manheim's compound in relationship to Vandor IV's terminator. (TNG: "We'll Always Have Paris")

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