Different type of sun clocks are found around the world in old time, the above photo is showing a type of old sun clock dubbed Equatorial bow sundial.
I'm lucky that the sun is shine when I looking onto this sun clock, the sundial shadow is falling onto 15:00, it is match to the time when this photo is shoot.
Some other type of astronomy observators are displaying in the garden of National Planetarium too.
Workshop Photo 1 : The Astronomy Observator of Chinese in old time
Workshop Photo 2 : The Astronomy Observator of Indian in old time
Edited by: shevchenko (19968)
An astronomy observator of India at old time, dubbed Jai Singh Observator.
The model of Guo Shou Jing Observator that displaying in the garden of National Planetarium.
The great observatory was built in 1276 in the early Yuan Dynasty on the order of Kublai Khan and was used by Guo Shoujing and Wang Xun (1235–1281) to observe the movement of the sun, the stars and record time. >>> Source / More Informations: Wikipedia