On 3 February your 0547 zone time DR...

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Question 1 of 2066636eea28f7522a1c51ade7

On 3 February your 0547 zone time DR position is LAT 24°18.5'N, LONG 167°25.0'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 three-body fix: good azimuth spread (ideally 90°–120° between bodies), and altitudes roughly between 20° and 70° above the horizon • Mix of bodies: planets can be very bright but may cluster in the same part of the sky; stars from different constellations often give better spread • Observer’s DR position and local sky: latitude 24°N and mid‑Pacific longitude affect which stars are high/low and where on the horizon they lie

💭 Think About

• Which choice gives you three bodies that are likely to be spread around the horizon rather than bunched in the same general direction? Think about where their constellations lie in the sky. • Looking at each group, are any of the bodies likely to be very high (near the zenith) or very low (near the horizon), making them poor choices for accurate sextant sights? • Does any group contain bodies that tend to track along a similar path in the ecliptic (like planets and zodiac stars), which could limit azimuth spread?

✅ Before You Answer

• For each option, picture the azimuth spread between the three bodies: are they roughly separated around the sky, or all in one quadrant? • Consider typical altitude ranges for those bodies at 24°N: avoid combinations where one might be nearly overhead or all are low. • Check whether the group has a good mix of right ascensions and declinations (i.e., from different parts of the sky), which improves the geometry of the fix.

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