Question 108Navigation Problems70% to pass
On 24 August your vessel is enroute from Perth, Australia, to Bombay, India. Evening twilight will occur at 1807 zone time and your vessel's DR position will be LAT 27°17.0' S, LONG 83°17.0' E. Considering their magnitude and location, what are the three stars best suited to observe for a fix at star time?
AI Explanation
The correct answer is A) Spica, Altair, Acrux.
This is the correct answer because these three stars are well-suited for observation at the given location and time. Spica and Altair are bright, first-magnitude stars that are easily identifiable in the night sky. Acrux is a prominent star in the Southern Cross constellation, which will be visible from the vessel's position near the south celestial pole.
The other answer choices are incorrect because the stars they mention are not as well-positioned for observation at the given latitude and longitude. For example, Arcturus, Antares, and Atria are more suitable for observations at different latitudes, while Pollux, Canopus, and Hamal are not as prominent or well-suited for the specific location and time.
Related Questions
#106 On 12 July your 0800 ZT DR position is LAT 24°15.0'N, LONG 132°30.0'W. Your vessel is on course 045°T at a speed of 15.0 knots. What is the ZT of local apparent noon (LAN)?#107 On 16 February your 0300 ZT DR position is LAT 28°32.0'S, LONG 176°49.0'E. You are on course 082°T at a speed of 21 knots. What will be the zone time of sunrise at your vessel?#109 On 1 October you determine the zone time of evening twilight will be 1835. Your DR position will be LAT 27°18.0' N, LONG 48°52.0' W. Considering their magnitude and location, which group of three stars are best suited to be used in obtaining a fix at star time?#110 On 22 March your 1834 ZT DR position is LAT 26°13.5' S, LONG 108°36.5' W. You observe an unidentified star bearing 077°T, at an observed altitude (Ho) of 43°10.5'. The chronometer reads 01h 32m 37s and is 01m 50s slow. What star did you observe?#111 On 3 February your 0550 zone time DR position is LAT 26°16.0' N, LONG 112°05.0' W. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?