On 29 April your 1913 zone time DR position is LAT 22°09.0' N, LONG 56°16.0' W. At that time you observe Polaris with a sextant altitude (hs) of 22°25.8'. The chronometer time of the sight is 11h 11m 14s, and the chronometer error is 02m 18s slow. The index error is 1.5' off the arc, and the height of eye is 61.5 feet. What is your latitude by Polaris?

Question

On 29 April your 1913 zone time DR position is LAT 22&deg;09.0' N, LONG 56&deg;16.0' W. At that time you observe Polaris with a sextant altitude (hs) of 22&deg;25.8'. The chronometer time of the sight is 11h 11m 14s, and the chronometer error is 02m 18s slow. The index error is 1.5' off the arc, and the height of eye is 61.5 feet. What is your latitude by Polaris?

Accepted Answer

Option C: 22&deg;39.9'N. Determine the LHA Aries for the time of observation. After correcting the sextant altitude for index error, dip, and refraction, apply the Polaris corrections from the Nautical Almanac. The calculation yields 22°39.9'N, which is the correct latitude based on the star's current position and the observer's longitude.