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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Left, 10-year-old Matthew Covell at the Centre for Life with a homemade planisphere
DARE words / terms Transposals acting pole optic angle aldermites (plural of misaltered (W2), misrelated (W2) aldermite) ambleshoot smoothable (W2) antigoslin insolating ants-mashers harassments apple shiner planisphere apron strap pro-Spartan (W2) aquadiente inadequate blow adders (plural of sword blade (W2) blow adder) blue martins (plural of bus terminal (OED), subterminal blue martin) bottle-arsed (from battledores bottle-arsed tupelo) cactus rose coruscates careless pin alpine cress castermine incremates (W2), metarsenic (W2), semitrance (a type of trance-like state (www.
Ashbery's latest collection, Planisphere (2009), is dedicated to David Kermani, his partner of 35 years.
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.
Andrea Bianco's 1436 world atlas juxtaposed three maps: a Ptolemaic planisphere and mappaemundi "in which Christian theology is made visible" (9) with a marine chart designed "for those who wish to sail by compass" (7).
They go on to introduce the children to a planisphere, a relatively inexpensive cardboard map that, through adjustment for month, day and time, allows a viewer to identify the constellations visible from his or her backyard.
Activities include a game called "Night Sky I Spy" and directions for making a planisphere and a night-sky dome.
To get started, buy yourself a good star guide or a Phillips Planisphere (readily available from book stores) and a torch with a red bulb (or simply use an ordinary torch and paint over with red nail varnish).
The Planisphere will allow visitors to go on a virtual journey to the stars and there will also be a multi-use lecture theatre, a command and control centre and a children's activity area.
As well as a book, this fun kit includes other neat items: a mini telescope, a solar system mobile, and a planisphere (turn the disks to find the constellations visible in the night sky at any time).
Astronomy club president and comet expert Tim Robertson will construct a model of a comet nucleus in a demonstration he calls ''the making of a comet,`` and kids can make their own ''star finder,`` a rotating planisphere that can be set to any time of the year so you can find the stars and constellations that are visible.
SPLENDOUR OF THE SEAS' Planisphere will be on a forward deck featuring a special black-out shade to shield the stargazers from the interior lights of the ship's Windjammer Cafe and a unique 5-1/2' wind screen to keep ocean winds to a minimum.