04:36 · These signs were used on the Swedish clog almanacs of the Middle Ages to signify the beginning of the summer half-year, the period from March to October. It began on April 13, the day of Tiburtius. This day was also drawn .
    Compare with , a sign used by the Euphrates-Tigris cultures, and with , found in the Altamira cave.
    See also , the beginning of the winter half-year, and see in Group 5 for facts about the clog almanacs.