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{%type%} Definitions

WordNet 3.0Copyright Princeton University
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Short "hint"

The inverse function of the secant; the angle that has a secant equal to a given number.

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Usage examples (19)
  • Night log #435: Very, very bad seeing averaging 4 arcsec to start.
  • Uranus is 2,856m km wide at opposition, its blue-green disc only 4 arcsec wide.
  • Jupiter shows a large 50 arcsec disc through a telescope, while binoculars reveal its four main moons.
  • For reference, the full moon is ~0. 5 degrees = 30 arcminutes = 1800 arcsec across, and 1 arcsec ~ 5e-6 radians.
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