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luminous range

noun, Navigation.
the distance at which a certain light, as that of a lighthouse, is visible in clear weather, disregarding interference from obstructions and from the curvature of the earth and depending on the power of the light. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Historical Examples
  • I hurriedly gaze through the luminous range bars, fixed at right angles to the direction bar.

    'Green Balls' Paul Bewsher

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