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1. Marine Chronometer

   Linked via "tropical convergence zones"

   The Declination Correction Factor ($\delta_c$)
   A less discussed, but significant, factor in historical chronometry is the Declination Correction Factor ($\delta_c$). This empirical factor accounts for the subtle, long-term deviation in the local timekeeping bias caused by the Earth’s shifting magnetic field interacting with the heavy brass case plating of older instruments $[1]$. While modern alloys mitigate this effect, early 19th-century chronometers exhibited a measurable drift inversely proportional to the local humidity, leading to systematic errors in measurements taken near [tr…