which the smaller hand indicates the minutes. The golden Sun on the hour hand is pivot-mounted so that it always faces up. The western clock face has similar hands, but is an integral part of Victor Surbek's 1929 fresco "Beginning of Time". The painting depicts Chronos swooping down with cape fluttering, and, below the clockface, Adam and Eve's eviction from Paradise by an angel. Astronomical clock The dial of the Zytglogge's astronomical clock is built in the form of an astrolabe. It is backed by a stereographically projected planisphere divided into three zones: the black night sky, the deep blue zone of dawn and the light blue day sky. The skies are crisscrossed with the golden lines of the horizon, dawn, the tropics and the temporal hours, which divide the time of daylight into twelve hours whose length varies with the time of year. Around the planisphere moves the rete, a web-like metal cutout representing the zodiac, which also features a Julian calendar dial. Above the rete, a display indicates the day of the week. Because leap days are not supported by the clockwork, the calendar hand has to be reset manually each leap year on 29 February. A moon dial circles the inner ring of the zodiac, displaying the moon phase. The principal hand of the clock indicates the time of day on the outer ring of 24 golden Roman numerals, which run twice from I to XII. It features two suns, the smaller one indicating the date on the rete'''s calendar dial. The larger one circles the zodiac at one revolution per year and also rotates across the planisphere once per day. Its crossing of the horizon and dawn lines twice per day allows the timing of sunrise, dawn, dusk and sunset. The painted frieze above the astronomical clock shows five deities from classical antiquity, each representing both a day of the week and a planet in their order according to Ptolemaic cosmology. From left to right, they are: Saturn with sickle and club for Saturday, Jupiter with thunderbolts for Thursday, Mars with sword and shield for Tuesday, Venus with Cupid for Friday and Mercury with staff and bag for Wednesday. Movement The clock dial has been dated to either the building phases of 1405 or 1467-83, or to the installation of the Brunner clockwork in 1527-30. Ueli Bellwald notes that the planisphere uses a southern projection, as