On 23 June in DR position LAT 21°39.0'S,...

Question 1 / 2066636eea28f7522a1c51ad5b

Question 1 of 2066636eea28f7522a1c51ad5b

On 23 June in DR position LAT 21°39.0'S, LONG 106°28.0'W, you observe an amplitude of the Sun. The Sun's center is on the celestial horizon and bears 078°psc. The chronometer reads 02h 14m 39s and is 01m 43s slow. Variation in the area is 9°W. What is the deviation of the standard magnetic compass?

Back

Question 1 of 20

66636eea28f7522a1c51ad5b

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Amplitude of the Sun and how it relates to true bearing at the horizon • Relationship between true bearing, magnetic bearing, variation, and deviation • How date, time, and DR position give you the Sun’s declination for the amplitude calculation

💭 Think About

• From the DR latitude and the Sun’s declination on 23 June, what is the computed true amplitude (east or west, north or south of east/west)? • Once you have the true bearing of the Sun, how do you step-by-step get from true to compass or from compass back to true using variation and deviation? • Given the Sun’s observed compass bearing 078°psc, and the local variation 9°W, what must the deviation be so that the corrected bearing matches your computed true bearing?

✅ Before You Answer

• Be sure you are using the correct sign for western variation when converting between true and magnetic. • Confirm you are treating the Sun as on the celestial horizon (use the amplitude formula, not a normal azimuth sight reduction). • Double-check whether deviation is named east or west based on whether the compass bearing is greater or less than the magnetic bearing.

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

Quick actions

— No credit card needed

Question 1 of 20

2.8°E

3.9°W

4.3°W

4.6°E

Loading interactive features...

Question 1 / 2066636eea28f7522a1c51ad5b

Question 1 of 2066636eea28f7522a1c51ad5b

Back

Question 1 of 20

66636eea28f7522a1c51ad5b

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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

Quick actions

— No credit card needed