Search results
Results from the WOW.Com Content Network
Philips' Planisphere, ca. 1900. In astronomy, a planisphere (/ ˈ p l eɪ. n ɪ ˌ s f ɪər, ˈ p l æ n. ɪ-/) is a star chart analog computing instrument in the form of two adjustable disks that rotate on a common pivot. It can be adjusted to display the visible stars for any time and date.
1577–80 – Taqi al-Din invents a mechanical astronomical clock that measures time in seconds, one of the most important innovations in 16th-century practical astronomy, as previous clocks were not accurate enough to be used for astronomical purposes. [13] 1577–80 – Taqi al-Din invents framed sextant [13]
The first known metal astrolabe in Western Europe is the Destombes astrolabe made from brass in the eleventh century in Portugal. [ 27 ] [ 28 ] (p 140) Metal astrolabes avoided the warping that large wooden ones were prone to, allowing the construction of larger and therefore more accurate instruments.
Planisphere made by Rumold Mercator. Rumold Mercator (Leuven, 1541 – Duisburg, 31 December 1599 [1]) was a cartographer, son of Gerardus Mercator and brother of Arnold Mercator, both also cartographers. He completed some at the time unfinished projects left after his father's death and added new materials of his own research.
A celestial map by the Dutch cartographer Frederik de Wit, 1670. A star chart is a celestial map of the night sky with astronomical objects laid out on a grid system. They are used to identify and locate constellations, stars, nebulae, galaxies, and planets. [1]
The date of drawing was formerly estimated at c. 992–994 CE, based on suggested links to the journey of Archbishop Sigeric of Canterbury from Rome [25] but more recent analysis indicates that, although the information was revised about that time, the map was probably drawn between 1025 and 1050.
On the hour, Death strikes the time, and the twelve apostles appear at the doors above the clock. Olomouc. The Olomouc astronomical clock at the Town Hall is a rare example of a heliocentric astronomical clock. Dated 1422 by legend, but first mentioned in history in 1517, the clock was remodelled approximately once every century; in 1898 the ...
The stereographic projection, also known as the planisphere projection or the azimuthal conformal projection, is a conformal map projection whose use dates back to antiquity. Like the orthographic projection and gnomonic projection , the stereographic projection is an azimuthal projection , and when on a sphere, also a perspective projection .