On 1 November your 1600 zone time DR...

Question 1 / 27070

Question 1 of 2707066636eea28f7522a1c51a9b8

On 1 November your 1600 zone time DR position is LAT 27°48'S, LONG 91°26'E. Your vessel is on a course of 327°T at a speed of 16 knots. What will be the zone time of sunset at your vessel?

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Question 1 of 27070

On 1 November your 1600 zone time DR position is LAT 27°48'S, LONG 91°26'E. Your vessel is on a course of 327°T at a speed of 16 knots. What will be the zone time of sunset at your vessel?

🔍 Key Concepts

• Zone time vs. GMT/UT and how longitude affects time of sunrise/sunset • Run between DR position and assumed longitude/standard meridian for the time zone • Using the Nautical Almanac sunset tables for the correct latitude and date

💭 Think About

• How do you find the approximate zone description (time zone) for longitude 91°26'E, and what standard meridian does that correspond to? • Once you know the zone description, what adjustments must you make between GMT sunset time from the Nautical Almanac and the local zone time at the ship? • How does the vessel’s movement between 1600 ZT and the time of sunset affect the longitude you should use for the sunset calculation?

✅ Before You Answer

• Confirm the correct time zone/zone description from the given longitude before looking up any times • Use the correct latitude band in the Nautical Almanac sunset tables for 1 November (S vs N and nearest whole degree or tabular interval) • Apply the run correction for the vessel’s motion along the course between 1600 and sunset before converting to final zone time