On 16 July your 1810 zone time DR position...

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Question 1 of 2066636eea28f7522a1c51ab15

On 16 July your 1810 zone time DR position is LAT 24°16.5' S, LONG 162°52.0' E. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?

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🔍 Key Concepts

• Star selection for a 3-body fix near twilight (magnitude, altitude, azimuth spread) • Effect of observer’s latitude (24° S) on which stars/planets are well placed in the sky • Why very high or very low altitudes are less desirable for a precise fix

💭 Think About

• From 24° S, which bodies in each group are likely to be too high, too low, or even below the horizon around common star-time observation periods? • Which group gives you three bodies that are all bright enough, and also well spread in azimuth (not all clumped in one part of the sky)? • Think about which groups mix planets and stars, and whether any one body might be so close to the zenith or horizon that its sight would be poor for a fix.

✅ Before You Answer

• For each choice, mentally place the bodies roughly in the sky at 24° S in July and ask: are any likely near the zenith (>75–80° altitude) or very low (<15°)? • Check that the group you prefer has bodies separated by at least 60° in azimuth and not all on the same side (all east or all west). • Verify that at least two of the three are well-known bright navigation stars/planets commonly used for star fixes.

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