73. On 13 August your 0345 ZT DR position is LAT 21°35.0'N, LONG 135°26.0'W. You are on course 052°T at a speed of 14 knots. What will be the zone time of sunrise at your vessel?

Sunrise time is determined by finding the local mean time of sunrise from the Nautical Almanac for the vessel's latitude, then converting to zone time using longitude and the zone description. The correct answer, calculated using these steps, is 0536 zone time.