Definition of optical double in English:

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optical double

noun

Astronomy
Two stars that are in the same line of sight as seen from the earth, but that may be at far different distances. See also double star.
Example sentences
  • At first he figured that such pairs consisted of two stars vastly distant from each other but coincidentally lying along a single line of sight - a visual phenomenon we now call optical doubles.
  • The physical doubles (or binary stars) are much more numerous than the optical doubles.

For editors and proofreaders

Syllabification: op·ti·cal dou·ble

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