1. JohannesJohann Hewel or Hewelke, 1611–87, Polish astronomer: charted the moon’s surface and discovered four comets.
  2. a walled plain in the second quadrant of the face of the moon: about 100 miles (160 km) in diameter.


  1. Johannes (joˈhanəs). 1611–87, German astronomer, who published one of the first detailed maps of the lunar surface

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