On 16 October evening twilight will occur at 1746 ZT. Your DR position will be LAT 28°43.2'N, LONG 60°29.8'W. Considering their magnitude and location, which of the following are the three best stars to select for a fix at star time?

Question

On 16 October evening twilight will occur at 1746 ZT. Your DR position will be LAT 28&deg;43.2'N, LONG 60&deg;29.8'W. Considering their magnitude and location, which of the following are the three best stars to select for a fix at star time?

Accepted Answer

Option C: Antares, Arcturus, Polaris. Selecting stars for a fix requires bodies separated by approximately 120 degrees in azimuth to minimize geometric dilution of precision. Per Bowditch, Antares, Arcturus, and Polaris provide optimal spread and magnitude for an evening fix at this latitude, ensuring a strong, reliable intersection of lines of position.

On 16 October evening twilight will occur at 1746 ZT. Your DR position will be LAT 28&deg;43.2'N, LONG 60&deg;29.8'W. Considering their magnitude and location, which of the following are the three best stars to select for a fix at star time?

On 16 October evening twilight will occur at 1746 ZT. Your DR position will be LAT 28°43.2'N, LONG 60°29.8'W. Considering their magnitude and location, which of the following are the three best stars to select for a fix at star time?