On 22 June your 0400 zone time DR position is LAT 23°00'N, LONG 81°45'W. You are steaming on course 110°T at a speed of 8.6 knots. What will be the zone time of sunrise at your vessel?

Correct Answer: Option C — 0541

Sunrise zone time is calculated using the Nautical Almanac's tabulated sunrise time for the given latitude and date, corrected for the vessel's longitude relative to the standard meridian and adjusted for vessel motion during the interval.