The LMT of sunrise on the standard meridian...

🔍 Key Concepts

• Local Mean Time (LMT) vs Zone Time (ZT) and how they relate to the standard meridian • How to convert a longitude difference into a time correction using 15° of longitude = 1 hour • Whether the ship is east or west of the standard meridian and how that affects whether you add or subtract time

💭 Think About

• First, decide what the standard meridian would be for your time zone based on your longitude of 99° 15' E. Is it ahead of or behind your actual longitude? • Next, convert the longitude difference between your position and the standard meridian into minutes of time. Is the difference more or less than 1 degree? • Finally, think carefully: if you are east of the standard meridian, does your local time occur earlier or later than at the standard meridian? Use that to decide if you should add or subtract the time correction from 0552.

✅ Before You Answer

• Confirm the standard meridian that corresponds to your ship’s time zone (a multiple of 15°). • Check the sign of the longitude difference (are you east or west of the standard meridian?). • Verify your time correction in minutes of time from the longitude difference before applying it to 0552.

The LMT of sunrise on the standard meridian is 0552. Your longitude is 99? 15' E. What is your ZT of sunrise?

512

529

552

615

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