On 24 March your vessel is enroute from...

Question 1 / 2066636eea28f7522a1c51ad8e

Question 1 of 2066636eea28f7522a1c51ad8e

On 24 March your vessel is enroute from Cadiz to Norfolk. Evening twilight will occur at 1830 zone time and your vessel's DR position will be LAT 35° 06' N, LONG 60° 48' W. Considering their azimuth, altitude, and magnitude, which group of stars is best suited for plotting a star fix at star time?

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🔍 Key Concepts

• Star selection for a 3-star fix (good spread in azimuth, suitable altitudes, bright magnitudes) • Using approximate altitude = 90° − |Lat − Dec| to judge if a star will be too high or too low • Effect of declination and hour angle on where a star appears in your sky at a given latitude and time

💭 Think About

• At latitude 35° N, which stars in each group are likely to be very high overhead (near the zenith) or very low near the horizon based on their declinations? • Looking at each group, which set of three gives you the best spread around the horizon (not all bunched in one quadrant of the sky)? • Which group uses mainly 1st‑magnitude stars, and avoids mixing in noticeably dimmer stars that are harder to observe at evening twilight?

✅ Before You Answer

• For each choice, mentally estimate altitude using the star’s declination and your latitude; avoid stars that would be >75° or <15° above the horizon at star time • Check whether the three stars in a choice are roughly 40°–120° apart in azimuth from each other rather than lying on the same general bearing • Verify that most stars in the group are bright (about 1st magnitude) to make sights easier and more precise in twilight conditions

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Question 1 of 20

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Question 1 / 2066636eea28f7522a1c51ad8e

Question 1 of 2066636eea28f7522a1c51ad8e

Back

Question 1 of 20

66636eea28f7522a1c51ad8e

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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