Sentence Examples


  • The polar clock, devised for use in place of a sun-dial, applies the fact that the plane of polarization of sky light is always 90° from the position of the sun; hence by measuring the azimuthal angle of the plane, even when the sun is below the horizon, correct apparent solar time may be obtained.
  • If this couple be absent, the axis will be tilted out of the horizontal plane in such a sense that the direction of the spin n approxi mates to that of the azimuthal rota- K