324. On 29 June you observe the star Achernar at a sextant altitude (Hs) of 54° 18.9'. The index error is 4.7' off the arc. The height of eye is 58 feet. What is the observed altitude (Ho)?

The observed altitude (Ho) is calculated by adding the index correction (4.7' since it's off the arc), subtracting the dip correction (7.4' for a 58-foot height of eye), and subtracting the small star correction (-0.7'), resulting in 54 15.5'.