You observe the lower limb of the Sun at a sextant altitude (hs) of 45°49.7' on 13 November . The index error is 1.0' on the arc. The height of eye is 61 feet (18.6 meters). What is the observed altitude (Ho)?

Question

You observe the lower limb of the Sun at a sextant altitude (hs) of 45&deg;49.7' on 13 November . The index error is 1.0' on the arc. The height of eye is 61 feet (18.6 meters). What is the observed altitude (Ho)?

Accepted Answer

Option B: 45&deg;56.4'. Following Bowditch, index error 'on the arc' is subtracted from sextant altitude. Applying dip for a 61-foot height of eye, standard lower limb semidiameter, and altitude refraction corrections produces an observed solar altitude (Ho) of 45&deg;56.4'.

You observe the lower limb of the Sun at a sextant altitude (hs) of 45&deg;49.7' on 13 November . The index error is 1.0' on the arc. The height of eye is 61 feet (18.6 meters). What is the observed altitude (Ho)?

You observe the lower limb of the Sun at a sextant altitude (hs) of 45°49.7' on 13 November . The index error is 1.0' on the arc. The height of eye is 61 feet (18.6 meters). What is the observed altitude (Ho)?