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The line joining the two points on the earth's orbit when it is farthest and closest to the sun. The point in the orbit where the earth is closest to the sun is called perihelion, and the point where it is farthest from the sun is known as aphelion.
References in periodicals archive ?
My brother Charley was there, of course, eight years older than me and very proud of his one gold stripe now that he'd been made an officer in the Apse line. Charley and father were talking, I just stood and listened to them and didn't say much of anything myself ...
Oh you'll probably sail on a lot of Apse line ships before you're through, Charley.