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Earth rate apparent drift at the equator is

  • A.1 degree per hour
  • B.Zero
  • C.15 degrees per hour
  • D.7.5 degrees per hour

Answer: B

The sine of zero latitude is zero, so a horizontal-axis gyro sees no apparent drift in azimuth there. The effect grows with latitude and is greatest at the poles, where the local vertical coincides with the earth's axis.

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