At 2237 ZT on 14 July you are in DR position...

Study

Question 1 of 2066636eea28f7522a1c51ad45

At 2237 ZT on 14 July you are in DR position LAT 33°57'N, LONG 150°32'W, when you observe an amplitude of Saturn. The planet is about one Sun's diameter above the visible horizon and bears 258.6°psc. The variation is 14°E. What is the deviation?

Back

Question 1 of 20

66636eea28f7522a1c51ad45

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 a celestial body near the horizon and how it relates to compass error • Relationship among compass bearing, true bearing, variation, and deviation ("True – Variation – Deviation = Compass" or similar memory aids) • Difference between magnetic and compass directions when variation is East or West

💭 Think About

• How do you convert the observed compass bearing of Saturn into a true bearing, step by step, using variation and deviation? • If the planet’s calculated true bearing (from sight reduction tables or star ID) does not match your compass bearing, what does that discrepancy represent? • When variation is 14°E, does magnetic north lie east or west of true north, and how does that affect the sign (E/W) of deviation you compute?

✅ Before You Answer

• Be consistent with your sign convention: decide whether you are using "True ± Variation = Magnetic" and "Magnetic ± Deviation = Compass", or the combined TVMDC memory aid, and stick to it. • Confirm whether an Easterly correction is added or subtracted in your chosen convention before deciding if the deviation is East or West. • Double‑check that you are using the correct horizon amplitude formula (lower limb/upper limb equivalent here) and that the body is close enough to the horizon for the approximation used in amplitude problems.

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

Quick actions

— No credit card needed