On 28 October morning twilight will occur...

Question 1 / 2066636eea28f7522a1c51add1

Question 1 of 2066636eea28f7522a1c51add1

On 28 October morning twilight will occur around 0524 ZT. Your DR position is LAT 25°25.0' N, LONG 32°33.3' W. Considering their magnitude and location, which group will be the three stars best suited to observe for a star fix at star time?

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🔍 Key Concepts

• Star selection for a twilight fix: you want stars that are well spread in azimuth (ideally 60°–120° apart) and at good altitudes (roughly 15°–75° above the horizon). • Observer’s position and sky area: your DR latitude (25° N) and local hour angle / GHA will affect which stars are high enough and not too close to the horizon or zenith. • Star magnitude and identification: brighter stars (lower magnitude numbers) are usually preferred for quick, accurate sights at twilight.

💭 Think About

• First think about your DR latitude 25° N: which of the listed stars are likely to be very far north, very far south, or near your zenith, and how does that affect their usefulness for a fix? • Consider the azimuth spread: if you draw rough bearings from your DR position to each candidate star, which choice gives you the widest, most even spread around the horizon? • At morning twilight, which of these stars are likely to be too low or not yet visible, versus comfortably above the horizon in the eastern and western parts of the sky?

✅ Before You Answer

• Check which stars in each choice give you good azimuth separation (avoid stars that are all in the same general quadrant of the sky). • Verify that each chosen star would have a reasonable altitude at that date and DR latitude—not grazing the horizon and not directly overhead. • Confirm that all stars in the group are bright, navigational stars commonly used in sight reduction (consult the star table for magnitude and declination).

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Question 1 / 2066636eea28f7522a1c51add1

Question 1 of 2066636eea28f7522a1c51add1

Back

Question 1 of 20

66636eea28f7522a1c51add1

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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