Which navigational outcome changed with the introduction of Harrison's H4 timekeeper relative to lunar distance methods?

💡 Explanation

With the H4 chronometer, calculating longitude at sea involved precise timekeeping because longitude is determined from the difference between local time and Greenwich Mean Time, a direct time-based calculation, providing superior accuracy compared prior to reliance on less accurate and tedious iterative methods using lunar distances. Therefore, accurate longitude was achieved, rather than latitude, direction or celestial measurements whose underlying principles are unrelated to measuring time accurately.

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