You observe the lower limb of the Sun at a sextant altitude (hs) of 22°58.6' on 16 June. The index error is 2.0' off the arc. The height of eye is 61 feet. What is the observed altitude (Ho)?

Correct Answer: Option A — 23°06.7'

Apply the index error (off the arc is additive) to the sextant altitude. Subtract the dip correction for a 61-foot height of eye and apply the total correction from the Nautical Almanac for the Sun's lower limb. This process yields an observed altitude (Ho) of 23°06.7', consistent with standard celestial reduction procedures.