At 1435 ZT on 27 April, in DR position LAT 51° 56.8'N, LONG 150° 37.7'E, the Moon's upper limb is observed on the visible horizon, bearing 242.2° psc. Variation is 2°W. What is the deviation?

Question

At 1435 ZT on 27 April, in DR position LAT 51&deg; 56.8'N, LONG 150&deg; 37.7'E, the Moon's upper limb is observed on the visible horizon, bearing 242.2&deg; psc. Variation is 2&deg;W. What is the deviation?

Accepted Answer

Option A: 2.2&deg;W. Extract lunar ephemeris data for the specific GMT observation time. Apply Bowditch amplitude formulas to obtain true bearing, integrating visible horizon corrections for the upper limb, and resolve standard compass deviation using applied variation.

At 1435 ZT on 27 April, in DR position LAT 51&deg; 56.8'N, LONG 150&deg; 37.7'E, the Moon's upper limb is observed on the visible horizon, bearing 242.2&deg; psc. Variation is 2&deg;W. What is the deviation?

At 1435 ZT on 27 April, in DR position LAT 51° 56.8'N, LONG 150° 37.7'E, the Moon's upper limb is observed on the visible horizon, bearing 242.2° psc. Variation is 2°W. What is the deviation?