The larger hand, which points to the hour, in fact records three different kinds of time. The outer ring of medieval Arabic numerals measures Old Bohemian time. The ring of Roman numerals indicates time as we know it. The inner part of the dial divided into 12 parts and with Arabic numerals represents the Babylonian time, the period of daylight was divided into 12 hours, which would vary in length from summer to winter. Furthermore, the little star by the zodiac ring shows the sidereal time.