You observe the lower limb of the Sun at a sextant altitude (hs) of 62°22.2' on 6 June. The index error is 1.2' on the arc. The height of eye is 28 feet (8.5 meters). What is the observed altitude (Ho)?

Correct Answer: Option B — 62°31.4'

Apply index error (on the arc is subtracted) and dip correction from height of eye tables to sextant altitude yielding apparent altitude. Add semi-diameter and refraction corrections from Bowditch to compute observed altitude (Ho) of 62°31.4'.