Data privacy and security practices may vary based on your use, region and age The developer provided this information and may update it over time. The clock is housed in a bevelled glass shade with an opening door at the front, making it easier to wind without removing the glass shade. If you choose to accept we will respect your privacy and will not set cookies that aren't necessary for the operation of the site. It indicates the moon phase on a rotating sphere above the dial, and the day of the week in an aperture at the base of the dial. The gear ratios may have been exquisitely calculated, but their manufacture was somewhat beyond the mechanical abilities of the time, and they never worked reliably.

When the dragon hand and the full Moon coincide, the Moon is on the same plane as the Earth and Sun, and so there is a good chance that a lunar eclipse will be visible on one side of the Earth. To enable personalized advertising (like interest-based ads), we may share your data with our marketing and advertising partners using cookies and other technologies.Daytime Breakdown: In addition to the Sun and Moon symbols, the clock offers further support with “Morning,” “Afternoon,” and “Evening” prompts, making it easier to comprehend the time of day.

This full-scale, fully functional replica, approximately 12 meters (39 feet) in height, was constructed from Su Song's original descriptions and mechanical drawings.By switching 'Schedule' to 'On' you are able to set individual bedtimes and wake-up times for each day of the week. The lower section provided a 24-hour dial and a large calendar drum, showing the fixed feasts of the church, the movable feasts, and the position in the zodiac of the moon's ascending node. The Science Museum (London) has a scale model of the 'Cosmic Engine', which Su Song, a Chinese polymath, designed and constructed in China in 1092.