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Bettinus

American  
[bet-n-uhs] / ˈbɛt n əs /

noun

  1. a crater in the third quadrant of the face of the moon: about 60 miles (96 km) in diameter.


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A similar instrument from the work of Bettinus is given on page 241, the distance of a ship being found by constructing an isosceles triangle.

From The Teaching of Geometry by Smith, David Eugene

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