Section II is used to record the Greenwich Mean Time (GMT) and date when the measurement was taken, as well as the dead reckoning (DR) position, which is a best guess of your current latitude and longitude. From our perspective, celestial bodies are constantly moving, so noting the time down to the second of a sextant measurement will yield the most accurate result.

Time is denoted as UT in The Nautical Almanac which is the time standard essentially equivalent to the zone time GMT.

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