planisphere


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planisphere

(plan -ă-sfeer) A two-dimensional map projection centered on the northern or southern pole of the celestial sphere that shows the principal stars of the constellations, the Milky Way, etc., and is equipped with a movable overlay to indicate the stars visible at a particular time on any day of the year for a particular zone of terrestrial latitude.

Planisphere

 

the representation of a sphere on a plane in a normal (polar) stereographic projection. The planisphere was used until the 17th century to determine the times of the rising and setting of celestial bodies. It was usually a coordinate grid etched on a metal disk about whose center an alidade that facilitated calculations rotated. The planisphere fell into disuse with the introduction of special tables and nomographs.

planisphere

[′plan·ə‚sfir]
(mapping)
A representation, on a plane, of the celestial sphere, especially one on a polar projection, with means provided for making certain measurements such as altitude and azimuth.
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References in periodicals archive ?
Planisphere is a search engine that connects to a national database of employers and their retirement plans, and will be available to advisors who are registered to sell MassMutual retirement plans.
I recalled that when I was in primary school I constructed a basic planisphere from a printout on cardboard.
Daniel Crouch Rare Books was able to announce a sale to an American institution--the only complete example of a planisphere of the Dutch Golden Age ($820,000; Fig.
The COP21 logo is pictured near a planisphere during the United Nations conference on climate change COP21, on December 1, 2015 at Le Bourget, on the outskirts of Paris.
The new planisphere is focused on the Pacific and makes Dubai a potential regional capital, a metropolis of Asia and, perhaps even the business capital of Africa, which fails to develop a secure centre.
(27) Eluard had recorded his route on a map, Les Cinq Parties du Monde, Planisphere, Comprenant toutes Ies Possessions Coloniales, a classic of the era that displayed, on a Mercator projection, English colonial possessions in yellow, French in pink, Dutch in orange, Italian in mauve, and so on.
Virilio calls the resulting upheavals the 'portable revolution,' which, along with revolutions in transportation and transmission technologies, will lead to what he calls an 'interactive planisphere.' Throughout the work, Virilio moves from the smaller scale (for instance, discussing the loading dock or the train station) to the larger scale (the city as a whole, or the whole world in movement), suggesting that these spaces of movement are ultimately ungovernable, at least in terms of conventional legal governance.
(1) Because Scorpio is much brighter than Orion; (2) Because the two constellations move to the same area at different times; (3) Because Scorpio moves faster than Orion; (4) Because Scorpio is closer to the earth" and "When we operate the planisphere (a device to show the locations of constellations), the position of Polaris changes from time to time (1) Yes; (2) No."
In an apartment of the great temple of Denderah, some fifty years ago, there was discovered upon the granite ceiling a sculptured and painted planisphere, abounding in centaurs, griffins, and dolphins, similar to the grotesque figures on the celestial globe of the moderns.
The cottages are on the edge of the Exmoor National Park, the first International Dark Sky Reserve in Europe, making it perfect for stargazing, and each comes equipped with its own planisphere and binoculars to help identify the constellations.
Each cottage equipped with its own planisphere and binoculars.