Editing Armillary sphere (section)

===Korea===
[[File:Korean celestial globe.jpg|thumb|left|Korean celestial globe]]
Chinese ideas of astronomy and astronomical instruments were introduced to Korea, where further advancements were also made. [[Jang Yeong-sil]], a [[Korean people|Korean]] inventor, was ordered by [[King Sejong the Great of Joseon]] to build an armillary sphere. The sphere, built in 1433 was named Honcheonui (혼천의,渾天儀).

The [[Honcheonsigye]], an armillary sphere activated by a working clock mechanism was built by the Korean astronomer Song Iyeong in 1669. It is the only remaining [[astronomical clock]] from the [[Joseon dynasty]]. The mechanism of the armillary sphere succeeded that of Sejong era's armillary sphere (Honŭi 渾儀, 1435) and celestial sphere (Honsang 渾象, 1435), and the Jade Clepsydra (Ongnu 玉漏, 1438)'s sun-carriage apparatus. Such mechanisms are similar to Ch'oe Yu-ji (崔攸之, 1603~1673)'s armillary sphere(1657). The structure of time going train and the mechanism of striking-release in the part of clock is influenced by the crown escapement which has been developed from 14th century, and is applied to gear system which had been improved until the middle of 17th century in Western-style clockwork. In particular, timing device of Song I-yŏng's Armillary Clock adopts the early 17th century pendulum clock system which could remarkably improve the accuracy of a clock.<ref>KIM Sang-Hyuk, [http://m.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=3b48615694989343ffe0bdc3ef48d419 A study on the operation mechanism of song I-yong`s armillary clock], Ph.D dissertation, JoongAng University</ref>

[[File:Fotothek df tg 0005688 Astronomie ^ Vermessung ^ Messinstrument.jpg|thumb|left|upright|Tycho Brahe's zodiacal armillary sphere, from his ''Astronomiae Instauratae Mechanica'' (Wandesburg, 1598), p. 36.]]