On 2 January you observe the lower limb of the Sun at a sextant altitude (hs) of 35°50.4'. The index error is 0.8' on the arc. The height of eye is 24 feet (7.3 meters). What is the observed altitude (Ho)?

Question

On 2 January you observe the lower limb of the Sun at a sextant altitude (hs) of 35&deg;50.4'. The index error is 0.8' on the arc. The height of eye is 24 feet (7.3 meters). What is the observed altitude (Ho)?

Accepted Answer

Option C: 35&deg;59.7'. Apply corrections to the sextant altitude (hs) in sequence: index error (off the arc is additive), dip (based on 24ft height of eye), and the combined altitude correction (refraction and parallax) from the Nautical Almanac. This yields the observed altitude (Ho) of 35°59.7' per standard celestial navigation procedures.

On 2 January you observe the lower limb of the Sun at a sextant altitude (hs) of 35&deg;50.4'. The index error is 0.8' on the arc. The height of eye is 24 feet (7.3 meters). What is the observed altitude (Ho)?

On 2 January you observe the lower limb of the Sun at a sextant altitude (hs) of 35°50.4'. The index error is 0.8' on the arc. The height of eye is 24 feet (7.3 meters). What is the observed altitude (Ho)?