The armillary sphere 's structure was very simple at the very beginning, with three rings and a metal axis. The outermost ring-meridian ring-was fixed in the north-south direction, the middle ring-equator ring-was parallel to the earth's e-quatorial plane, and the innermost one-Chijing ring-could revolve around the metal axis. The Chijing ring and the metal axis intersected at two points, with one pointing to the North Pole and the other to the South Pole. An observatory tube was fixed on the Chijing ring and could rotate around the center of the ring. Astronomical clock tower is a high-terrace building combined with armillary sphere , celestial globes and time indicator, which is functioning as a concentrated micro observatory by driving water wheels to intermittent movement with constant flow of tower was built up in 1092 by Susong and Han Gonglian in Song Dynasty. In the middle of the Eastern Han Dynasty, Zhang Heng, an outstanding astronomer, made bold innovations to the armillary sphere , and de-signed and made the first water-driven armillary sphere in the world to measure the position of celestial bodies, which was carved with known important astronomical phenomena. People could observe the movement of the sun, the moon and the stars. The Armillary Sphere was an astronomic observatory instrument in ancient China. The ancient people believed the heaven was round, just like an egg, with the stars in the sky resembling the round pills beset in the shell and the earth like the yolk. People used the armillary sphere to examine the position of celestial bodies from the earth. The world's first water-driven astronomic instrument with explicit historical re-cords, the new armillary sphere employed an extremely complex gear system. It was a proud achievement for ancient Chinese people to work out such a complex instrument. Unfortunately, the driving system was not handed down, as made in the remote past. Translation in context Traduction en contexte Traducción en contexto Tradução em contexto Traduzione in contesto Übersetzung im Kontext الترجمة في السياق 文脈に沿った翻訳 Vertaling in context תרגום בהקשר Перевод в контексте Tłumaczenie w kontekście Traducere în context Översättning i sammanhang İçerik tercümesi Переклад у контексті