On 4 September your 1813 zone time DR position is LAT 24°18.0' S, LONG 95°16.0' E. Considering their magnitude, azimuth, and altitude, which group includes the three stars best suited for a fix at star time?

Correct Answer: Option A — Rasalhague, Fomalhaut, Spica

Optimal star selection requires good geographic separation in azimuth (ideally 120 degrees apart), moderate altitudes (above 15° and below 75°), and bright magnitudes. Rasalhague, Fomalhaut, and Spica provide the required geometric intersection angles and brightness for a reliable fix in the southern hemisphere.