On 25 February at 0622 ZT, you observe the upper limb of the Moon with a sextant altitude of 59°58.6'. Your DR position is LAT 30°28.3'S, LONG 102°39.3 E. The chronometer reading at the time of the sight is 11h 21m 18s and the chronometer is 48s slow. The height of eye is 59 feet and the index error is 2.5' on the arc. What are the azimuth (Zn) and intercept (a) of this sight using the assumed position?

Question

Accepted Answer

Option B: Zn 305.4°, a 4.2°T. Applying dip, semi-diameter, and parallax corrections to the sextant altitude of the Moon per Bowditch yields the observed altitude. Entering the Nautical Almanac and Pub. No. 229 with the assumed position produces an intercept of 4.2° toward and an azimuth of 305.4°.