On 25 May your vessel's 1917 zone time position is LAT 24°16.0'N, LONG 017°26.0'W. At that time a sextant observation of the planet Saturn was made. The sextant altitude is 63°05.1', and the chronometer reads 08h 18m 24s. The index error is 4.5' off the arc, and the chronometer error is 01m 05s fast. Your height of eye is determined to be 62.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Question

On 25 May your vessel's 1917 zone time position is LAT 24&deg;16.0'N, LONG 017&deg;26.0'W. At that time a sextant observation of the planet Saturn was made. The sextant altitude is 63&deg;05.1', and the chronometer reads 08h 18m 24s. The index error is 4.5' off the arc, and the chronometer error is 01m 05s fast. Your height of eye is determined to be 62.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Accepted Answer

Option B: 147.3&deg;. Convert chronometer time to GMT to extract GHA and Dec from the Nautical Almanac. Calculate LHA using the assumed longitude. Use Pub. 229 to determine the azimuth angle (Z) based on the AP latitude and LHA, then convert to the true azimuth (Zn) of 147.3°.