On 22 August your 1852 zone time DR position is LONG 155°54.0'E. At that time you observe Polaris with a sextant altitude (hs) of 27°36.9'. The chronometer time of the sight is 08h 54m 06s, and the chronometer error is 02m 20s fast. The index error is 3.6' off the arc, and the height of eye is 61.5 feet. What is your latitude by Polaris?

Question

On 22 August your 1852 zone time DR position is LONG 155&deg;54.0'E. At that time you observe Polaris with a sextant altitude (hs) of 27&deg;36.9'. The chronometer time of the sight is 08h 54m 06s, and the chronometer error is 02m 20s fast. The index error is 3.6' off the arc, and the height of eye is 61.5 feet. What is your latitude by Polaris?

Accepted Answer

Option C: 28&deg;05.9'N. Latitude by Polaris requires applying corrections from the Nautical Almanac to the observed altitude. After adjusting for index error, dip, and refraction, the Ho is corrected using the LHA of Aries. The resulting calculation confirms 28°05.9'N, consistent with standard procedures for determining latitude via the North Star.