On 28 July your 1937 zone time DR position is LAT 26°13.0'N, LONG 78°27.0'E. At that time, you observe Deneb bearing 048.7°pgc. The chronometer reads 02h 37m 42s, and the chronometer error is 00m 15s fast. The variation is 4°W. What is the gyro error?

Question

On 28 July your 1937 zone time DR position is LAT 26&deg;13.0'N, LONG 78&deg;27.0'E. At that time, you observe Deneb bearing 048.7&deg;pgc. The chronometer reads 02h 37m 42s, and the chronometer error is 00m 15s fast. The variation is 4&deg;W. What is the gyro error?

Accepted Answer

Option B: 2.8&deg;E. Determine GMT and corresponding Greenwich Hour Angle for Deneb. Solve the PZX celestial triangle to find true azimuth, and compare the result against the recorded gyro bearing to establish the exact gyro error.

On 28 July your 1937 zone time DR position is LAT 26&deg;13.0'N, LONG 78&deg;27.0'E. At that time, you observe Deneb bearing 048.7&deg;pgc. The chronometer reads 02h 37m 42s, and the chronometer error is 00m 15s fast. The variation is 4&deg;W. What is the gyro error?

On 28 July your 1937 zone time DR position is LAT 26°13.0'N, LONG 78°27.0'E. At that time, you observe Deneb bearing 048.7°pgc. The chronometer reads 02h 37m 42s, and the chronometer error is 00m 15s fast. The variation is 4°W. What is the gyro error?