the.com/chronometer
A clock so accurate it once decided where ships were allowed to be.
means A high-precision timekeeping instrument, especially one accurate enough to determine longitude at sea.
from From Greek chronos (time) plus metron (measure) — literally a time-measurer, coined in 1714 just as Britain offered a fortune to anyone who could conquer longitude.
Longitude prizeHarrison's sea clock won the era's biggest tech reward.
Certified termSwiss watches earn the title only after official testing.
Lives savedKnowing position prevented countless shipwrecks at sea.