90. On 10 April, your 1630 ZT DR position is LAT 21°03.0'N, LONG 63°11.0'W. You are on course 324°T at a speed of 22 knots. What will be the zone time of sunset at your vessel?

The zone time of sunset is calculated by first determining the local mean time (LMT) of sunset from the Nautical Almanac, then applying a correction based on the longitude difference from the zone meridian. The longitude difference of 311′ west of the +4 zone meridian (60W) equates to approximately 13 minutes, resulting in a zone time of 1833.