You observe the lower limb of the Sun at a sextant altitude (hs) of 28°24.7' on 17 May. The index error is 1.5' off the arc. The height of eye is 86 feet (26 meters). What is the observed altitude (Ho)?

Question

You observe the lower limb of the Sun at a sextant altitude (hs) of 28&deg;24.7' on 17 May. The index error is 1.5' off the arc. The height of eye is 86 feet (26 meters). What is the observed altitude (Ho)?

Accepted Answer

Option C: 28&deg;31.5'. Apply the index error of +1.5' to the hs of 28°24.7'. Subtract the dip correction for 86 feet (-9.1') and add the Sun's combined altitude correction (+14.4'). The resulting calculation provides an observed altitude (Ho) of 28°31.5', consistent with standard celestial navigation procedures outlined in the Nautical Almanac.

You observe the lower limb of the Sun at a sextant altitude (hs) of 28&deg;24.7' on 17 May. The index error is 1.5' off the arc. The height of eye is 86 feet (26 meters). What is the observed altitude (Ho)?

You observe the lower limb of the Sun at a sextant altitude (hs) of 28°24.7' on 17 May. The index error is 1.5' off the arc. The height of eye is 86 feet (26 meters). What is the observed altitude (Ho)?