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)?

Correct Answer: Option A — 35°59.7'

Apply the index error (on the arc is subtractive) to the sextant altitude. Use the Nautical Almanac's Dip table for a 24-foot height of eye, then apply the combined altitude correction for the Sun's lower limb. The resulting Ho is 35°59.7', following standard Bowditch celestial reduction procedures.