Isn't the azimuth calculated then the bearing taken? If the two agree then the gyro/compass error is zero?
For example, a celestial object can be directly overhead and still have an azimuth but it would be very difficult to take a bearing of it. That is why gyros and compasses are checked with the suns azimuth when the sun is near the horizon (normally).
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There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217
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