During evening twilight on 28 December a sextant altitude (hs) of the planet Venus was 29°43.2'. The height of eye was 40 feet, and the index error was 2.0' on the arc. What was the observed altitude (Ho)?

Question

During evening twilight on 28 December a sextant altitude (hs) of the planet Venus was 29&deg;43.2'. The height of eye was 40 feet, and the index error was 2.0' on the arc. What was the observed altitude (Ho)?

Accepted Answer

Option A: 29&deg;34.1'. Apply corrections to the sextant altitude (hs) in sequence: index error, dip (height of eye), and total correction (refraction and parallax). With a 40-foot height of eye and 2.0' index error on the arc, the net correction results in an observed altitude (Ho) of 29°34.1'.

During evening twilight on 28 December a sextant altitude (hs) of the planet Venus was 29&deg;43.2'. The height of eye was 40 feet, and the index error was 2.0' on the arc. What was the observed altitude (Ho)?

During evening twilight on 28 December a sextant altitude (hs) of the planet Venus was 29°43.2'. The height of eye was 40 feet, and the index error was 2.0' on the arc. What was the observed altitude (Ho)?