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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.
The word planisphere (Latin planisphaerium) was originally used in the second century by Ptolemy to describe the representation of a spherical Earth by a map drawn in the plane. [ 2 ] Planisphere
Planisphere or Planisphaerium, a 2nd-century AD book by Claudius Ptolemy about mapping the celestial sphere onto a flat plane using the stereographic projection to make a star chart Planispheric astrolabe , a device consisting of a planisphere joined to a dioptra, used for observing stars and performing astronomical calculations
David Baldacci was born and raised in Richmond, Virginia.He is of Italian descent. He graduated from Henrico High School and earned a B.A. in political science from Virginia Commonwealth University and a Juris Doctor from the University of Virginia School of Law, after which he practiced law for nine years in Washington, D.C.
11th century – Planisphere invented by Biruni [7] 11th century – Universal latitude-independent astrolabe invented by Abū Ishāq Ibrāhīm al-Zarqālī (Arzachel) [8] 1023 – Hamedan observatory in Persia; c. 1030 – Treasury of Optics by Ibn al-Haytham (Alhazen) of Iraq and Egypt; 1074–92 – Malikshah Observatory at Isfahan used by ...
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 .
Bianchini's planisphere, produced in the 2nd century, [14] shows Greek personifications of planetary gods charged with early versions of the planetary symbols: Mercury has a caduceus; Venus has, attached to her necklace, a cord connected to another necklace; Mars, a spear; Jupiter, a staff; Saturn, a scythe; the Sun, a circlet with rays ...
Petrus Plancius Instructing Students in the Science of Navigation, by David Vinckboons. In 1592 Plancius published his best known world map, titled "Nova et exacta Terrarum Orbis Tabula geographica ac hydrographica". Only one remaining copy is known to exist, preserved at the Colegio del Corpus Christi in Valencia, Spain.