Time measure anciently to determine longitude was by the precession rate of the earth’s axis measured against the backdrop of the stars in the night sky, 72 years per degree (of 360), the method lost through the millennia, later though Napoleon by the recently invented Harrison’s Chronometer reestablished length/distance measure by geometry too, but by the measure of time by modern clocks, not by the precession rate of the earth’s axis then measured using such as the Celtic Cross and the Dixon Relics.
