On 23 July your 1700 zone time DR position...

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Question 1 of 2066636eea28f7522a1c51ad56

On 23 July your 1700 zone time DR position is LAT 27° 29' N, LONG 129° 26' W. You are on course 079° T at a speed of 20 knots. 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 (good azimuth spread of about 120° total, not all on same side of sky) • Altitude limits for sights (generally between about 20° and 75° for best accuracy) • Relative brightness (magnitude) and reliability of stars vs. planets vs. Polaris for running fixes vs. position fixes

💭 Think About

• First, imagine yourself at 27° N in late July around evening nautical twilight: which of these bodies would likely be high overhead, which low near the horizon, and which spread around the horizon? • Consider whether Polaris is usually chosen for a simultaneous 3-body fix, or more often used for latitude or a separate line of position. • Compare each group: do any have two or more bodies likely to be in nearly the same direction or similar altitude, giving you poor crossing angles for a fix?

✅ Before You Answer

• For each choice, check if the three bodies would give good azimuth separation (not bunched within the same quadrant of the horizon). • Check if any body in the group is typically too high or too low in altitude for a precise sight at that date/latitude. • Verify which bodies in each group are bright, easily observed navigation stars/planets versus ones that might be less ideal for quick, accurate star-time fixes.

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