How can the accuracy of an azimuth circle be checked?

Correct Answer: Option B — comparing observed azimuths at different altitudes with computed values at the times of observation to see if the difference is constant

To verify the accuracy of an azimuth circle, compare observed azimuths of a celestial body at varying altitudes against computed values from the Nautical Almanac or Pub 229. If the difference remains constant across multiple observations, the error is likely index error, which can be accounted for during subsequent navigational calculations.