a. Either of two points in the orbit of a solar system body where the body is in opposition to or in conjunction with the sun. b. Either of two points in the orbit of the ...
the nearly straight-line configuration of three celestial bodies (as the sun, moon, and earth during a solar or lunar eclipse) in a gravitational system. Editor's note: ...
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If three celestial bodies in any solar system are lined up, you could say they're