The Astronomical Clock: Hampton Court Palace

It was installed in 1540 (although there were earlier clocks at the palace) and, as well as telling the hour, the day and the month, it shows the phases of the moon and its age in the month, the signs of the zodiac, the movement of the sun (according to pre-Copernican theory), and, most usefully for the members of the court, who usually travelled by barge, the time of high tide at London Bridge.