On 22 July at 0720 ZT, in DR position LAT 20°38.2'N, LONG 87°16.0'W, you observe the Moon's lower limb. The sextant altitude (hs) is 38°32.6, and the chronometer reads 01h 18m 14s. The chronometer is 01m 28s slow. The index error is 3.1' off the arc, and the height of eye is 68 feet. What is the azimuth (Zn) and intercept (a) of this sight from the assumed position?

Question

On 22 July at 0720 ZT, in DR position LAT 20&deg;38.2'N, LONG 87&deg;16.0'W, you observe the Moon's lower limb. The sextant altitude (hs) is 38&deg;32.6, and the chronometer reads 01h 18m 14s. The chronometer is 01m 28s slow. The index error is 3.1' off the arc, and the height of eye is 68 feet. What is the azimuth (Zn) and intercept (a) of this sight from the assumed position?

Accepted Answer

Option C: Zn 248.6&deg;, a 5.0' T. Applying Bowditch procedures, correct chronometer time to GMT, extract GHA and declination from the Nautical Almanac, apply index error and dip to the sextant altitude, compute local hour angle, and solve the navigational triangle to derive azimuth and intercept.