You observe the lower limb of the Sun at a sextant altitude (hs) of 75°12.3' on 6 August. The index error is 1.5' off the arc. The height of eye is 32 feet (9.8 meters). What is the observed altitude (Ho)?

Correct Answer: Option A — 75°24.0'

Apply index error (off = subtract) to the sextant altitude. Subtract the dip correction for a 32-foot height of eye. Apply the Sun's altitude correction (including semi-diameter and parallax) from the Nautical Almanac. The resulting observed altitude (Ho) is 75°24.0', following standard celestial navigation reduction procedures.