Article Number 47106
Ø 6 cm. Weight 40 g. Comes with directions for use.
Universal ring sundial.
This pocket sundial can be used anywherein the world without any additionalaid. It’s based on the simple principlethat in the course of the solar yearthe angle of the sun in relation to theequatorial plane (the so-called declination)assumes specific daily values. Inorder to determine the time of day, thegnomon (shadow caster) of the sundialis adjusted to the calendar date. Theangle of the punched mask to the inneredge of the chapter ring then correspondsto the declination of each dayand the correct (astronomical) time canbe read on the inner edge of the ring.In order to calculate CET one adds fourminutes for every longitudinal degreewest of the location of measurement.
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