Your 0900 DR position is LAT 23°16'N, LONG...

Question 1 / 2066636eea28f7522a1c51a971

Question 1 of 2066636eea28f7522a1c51a971

Your 0900 DR position is LAT 23°16'N, LONG 146°12'E. Your vessel is on a course of 286°T, at a speed of 14.5 knots. Determine the zone time of LAN on 14 March.

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66636eea28f7522a1c51a971

Your 0900 DR position is LAT 23°16'N, LONG 146°12'E. Your vessel is on a course of 286°T, at a speed of 14.5 knots. Determine the zone time of LAN on 14 March.

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🔍 Key Concepts

• Local Apparent Noon (LAN) occurs when the Sun is on your meridian (crosses your longitude) – not when your clock says 1200 • At 15° of longitude per hour, the Sun appears to move 1° of longitude every 4 minutes of time • To get zone time of LAN, you must use both: (1) the time difference between your longitude and the central meridian of your time zone, and (2) the equation of time for 14 March from the Nautical Almanac

💭 Think About

• First, from your DR longitude, decide what time zone you are in and what the central meridian for that zone is; is your longitude east or west of that central meridian? • Next, convert the longitude difference between your position and the central meridian into time (using 4 minutes of time per degree of longitude) and think about whether LAN will occur earlier or later than 1200 zone time. • Finally, look up the equation of time for 14 March in the Nautical Almanac: does it say the apparent Sun is fast or slow, and does that make LAN occur before or after mean noon in zone time?

✅ Before You Answer

• Confirm your zone description (ZD) and corresponding central meridian from your DR longitude, making sure the sign (E or W) is correct. • Double-check your conversion of longitude difference to time (degrees and minutes of arc into hours and minutes of time) using 1° = 4 minutes of time and 15° = 1 hour. • Verify from the Nautical Almanac whether on 14 March the Sun is fast or slow and apply the equation of time in the correct direction to adjust from 1200 zone time to the actual LAN time.

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Question 1 of 20

Your 0900 DR position is LAT 23°16'N, LONG 146°12'E. Your vessel is on a course of 286°T, at a speed of 14.5 knots. Determine the zone time of LAN on 14 March.

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Question 1 / 2066636eea28f7522a1c51a971

Question 1 of 2066636eea28f7522a1c51a971

Your 0900 DR position is LAT 23°16'N, LONG 146°12'E. Your vessel is on a course of 286°T, at a speed of 14.5 knots. Determine the zone time of LAN on 14 March.

Back

Question 1 of 20

66636eea28f7522a1c51a971

Your 0900 DR position is LAT 23°16'N, LONG 146°12'E. Your vessel is on a course of 286°T, at a speed of 14.5 knots. Determine the zone time of LAN on 14 March.

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