On 1 July your 0515 ZT fix gives you a position of LAT 24°36.0'S, LONG 151°42.0'W. Your vessel is on course 300°T, and your speed is 10.0 knots. Local apparent noon (LAN) occurs at 1215 ZT, at which time a meridian altitude of the Sun's lower limb is observed. The observed altitude (Ho) for this sight is 42°55.0'. What is the calculated latitude at LAN?

Correct Answer: Option D — 24°01.0'S

Meridian altitude calculation requires determining the zenith distance (90° - Ho) and applying the Sun's declination. On 1 July, declination is approximately 23°06.0'N. With Ho 42°55.0', the zenith distance is 47°05.0'N. Combining this with the declination for a Southern Hemisphere observer results in a latitude of 24°01.0'S.