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.
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 evolution of photosynthesis made it possible for cells to derive energy from the Sun. [106]: 377 Most of the life that covers the surface of Earth depends directly or indirectly on photosynthesis. The most common form, oxygenic photosynthesis, turns carbon dioxide, water, and sunlight into food.
The Fra Mauro map was made between 1457 and 1459 by the Venetian monk Fra Mauro. It is a circular planisphere drawn on parchment and set in a wooden frame, about 2 metres (6 ft 7 in) in diameter. The original world map was made by Fra Mauro and his assistant Andrea Bianco, a sailor-cartographer, under a commission by king Afonso V of Portugal.
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 .
Possible remains of biotic life were found in 4.1 billion-year-old rocks in Western Australia. [26] [27] Probable origin of life. 4000 Ma Formation of a greenstone belt of the Acasta Gneiss of the Slave craton in northwest Canada - the oldest known rock belt. [28] 3900–2500 Ma Cells resembling prokaryotes appear. [29]
Latest possible date for a secondary atmosphere to form, produced by the Earth's crust outgassing, reinforced by water and possibly organic molecules delivered by comet impacts and carbonaceous chondrites (including type CI shown to be high in a number of amino acids and polycyclic aromatic hydrocarbons (PAH)). c. 4,300 Ma – Nectarian Era ...
This yielded more accurate measurements of Earth's circumference and made it possible for a single person to measure it from a single location. [64] [65] [66] Biruni's method was intended to avoid "walking across hot, dusty deserts", and the idea came to him when he was on top of a tall mountain in India (present day Pind Dadan Khan, Pakistan ...