Geochron,worldl time indicator. Working model showing the relation between the rotating Earth and the time at one instant in any place. It shows sunrise, sunset, midday, date and the mont. The daylight area is electrically illuminated. The Geochron is adjusted by turening knobs underneath it. It was purchased for display in the Tercentenary Exhibition 1974/75 from Killberg Geochron Corp., San Mateo, California, USA.