Definition of star gauge in English:

star gauge

(US star gage)

noun

  • 1(Astronomy, now historical) (W. Herschel's term for) a determination of the number of stars visible in a given region of the sky, by averaging a number of observations.

  • 2A gauge with radiating steel points for measuring the bore of a gun barrel at any part of its length.

Origin

Late 18th century; earliest use found in William Herschel (1738–1822), musician and astronomer.