horizon glass

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English[edit]

Noun[edit]

horizon glass (plural horizon glasses)

  1. (now historical) A half-silvered piece of glass mounted in a quadrant or sextant, so that the horizon can be seen at the same time as the reflection of a heavenly body.
    • 2006, Hampton Sides, Blood and Thunder, Abacus, published 2014, page 258:
      On the morning of August 25, shortly after breaking camp, he looked back with his horizon glass and caught a majestic glimpse of Cabezon Peak […] .
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