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Looking through the third floor windows to see the celestial globe in Su Song's Water Clock.
This picture is from a scaled model of Su Song's water-powered clock tower.
The original clock tower was 35 feet tall.
It was a 3 story tower with an armillary sphere on the roof, and a celestial globe on the third floor.
This picture was taken in July 2004 from an exhibition at Chabot Space & Science Center in Oakland, California.
The quality of the picture is not ideal because flash photography was not allowed.
The plaque at the exhibit said:
Su Song's Clock
A legend says a mistake created this clock.
Long ago, one of the Emperor's advisors, Su Song, carried a birthday greeting to an emperor in another country.
Su Song arrived one day early and was embarrassed that China's calendar wasn't accurate.
He asked his Emperor to let him make a better clock to keep track of dates and times.
A Time-Consuming Project
It took Su Song seven years to finish his water-powerd astronomical clock.
It included an armillary sphere, a celestial globe, and a system for announcing the time.
Su Song's wonderful clock was used for 36 years.
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