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The maximum earth rate apparent drift a horizontal-axis gyro can experience, and where it occurs, is

  • A.15 degrees per hour, at the poles
  • B.15 degrees per hour, at the equator
  • C.7.5 degrees per hour, at mid latitudes
  • D.30 degrees per hour, at the poles

Answer: A

The drift is \( 15\sin(\mathrm{latitude}) \) degrees per hour, and the sine reaches one only at the pole. There the earth's axis coincides with the local vertical, so a full rotation of the reference frame appears in azimuth over a sidereal day.

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