Show century sundials were elaborate devices the most elaborate sundials ever made were the portable watch vatch sized instruments designed in in europe between the and lath centuries says colliers besides a compass some contained as many as 15 devices am among ong them being for example dials for determining the nocturnal hour by either the moon or certain stars an adjustment for changes in latitude a diagram showing planetary positions and a contrivance for ascertaining tile the time when the sun and moor wo would uld rise and set |