In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03°35.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10°C and the barometer reads 1010 millibars. What is the observed altitude (Ho)?

Question

In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03&deg;35.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10&deg;C and the barometer reads 1010 millibars. What is the observed altitude (Ho)?

Accepted Answer

Option B: 03&deg;15.8'. According to Bowditch, compute observed altitude by applying height of eye dip correction, index error, and standard refraction. Under extreme cold (-10¼irc) and high pressure, enter the Nautical Almanac temperature/pressure correction table for additional refraction adjustments, resulting in an Ho of 03°15.8'.

In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03&deg;35.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10&deg;C and the barometer reads 1010 millibars. What is the observed altitude (Ho)?

In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03°35.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10°C and the barometer reads 1010 millibars. What is the observed altitude (Ho)?