111. On 13 February at 0325 zone time, your DR position is LAT 23°20'N, LONG 155°15'W. You are steering 240°T at a speed of 13.6 knots. What is the zone time of sunrise?

Sunrise zone time is calculated by adding the longitude difference, converted to minutes, to the Local Mean Time (LMT) of sunrise obtained from the Nautical Almanac. The longitude difference between the ship's position (15515'W) and the zone meridian (15000'W) is 515', which equates to 21 minutes. Therefore, adding 21 minutes to the LMT of 0636 results in a zone time of 0657.