You are keeping ZD +4 on your vessel. On 21...

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Question 1 of 2066636eea28f7522a1c51b354

You are keeping ZD +4 on your vessel. On 21 June at 0906 DST, your position is LAT 30°48.0'N, LONG 71°00.0'W. You are on a course of 167°T at 15.2 knots. At what time will local apparent noon (LAN) occur ZT at your vessel? You are keeping DST.

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Question 1 of 20

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🔍 Key Concepts

• Zone Description (ZD) and the difference between Zone Time (ZT) and Daylight Saving Time (DST) • How longitude affects the time of local apparent noon (LAN) (4 minutes of time per degree of longitude from the standard meridian) • Using the Nautical Almanac for 21 June to find the approximate Greenwich Hour Angle (GHA) of the Sun at meridian passage and adjust for your longitude

💭 Think About

• First convert the given 0906 DST to the corresponding ZT using the ZD +4. What is the relationship between DST and standard ZT in this zone? • Estimate when the Sun will cross your meridian based on your longitude relative to the central meridian of your time zone. Is your longitude east or west of that meridian, and does that make LAN earlier or later than 1200 ZT? • From your 0906 time and your course/speed, estimate how far you will travel in longitude by the time of LAN. Will your change in longitude significantly change the LAN time?

✅ Before You Answer

• Be sure you are clear whether you should answer in ZT or DST (the question specifies LAN time "ZT" while stating you are keeping DST). • Verify your time conversion: DST usually differs from ZT by 1 hour in many zones—confirm which way the adjustment goes for ZD +4. • Check that your final LAN estimate is reasonable: near 1200 local time but shifted according to your longitude from the standard meridian and any equation-of-time correction for 21 June.

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