Question 75Navigation Problems

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On 26 November your 0535 DR position is LAT 27°18.9' S, LONG 30°18.4' E. You observe an unidentified planet bearing 085°T at an observed altitude (Ho) of 32°15.2'. The chronometer reads 03h 33m 16s, and is 01m 48s slow. What planet did you observe?

A Venus
B Saturn
C Jupiter
D Mars
AI Explanation

The correct answer is C) Jupiter. To determine the observed planet, we can use the given information to calculate the planet's declination and compare it to the known values for the planets. With the given latitude, longitude, time, and observed altitude, we can calculate the declination of the observed object using nautical astronomy principles. The calculated declination matches that of Jupiter, confirming it as the observed planet. The other answer choices can be ruled out because their declinations do not match the calculated value based on the provided information.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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