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 ?
The typical half-moon string of islands, ending in the Moluccas that he established can be found on the planispheres of Pedro Reinel (1517 & 1518) and the Pedro Reinel map of 1519 (Cortesao 1960, v.
The western hemisphere however, the other half of the world, was only shown on globes, the closely-related hemisphere maps, and the large manuscript planispheres.
The planisphere, showing the whole 360-degree world, starts with Reinel's 1519 (Kunstmann IV) map, the 1523 Turin world map, the 1525 Castiglione and Ambrosiana planispheres, and the Weimar I (1527) and Weimar II (1529, Ribeiro) planispheres.
Peuerbach is known to have bought many of the early manuscript planispheres that later ended up in the Armeebibliothek in Munich and that now constitute the corpus of the Kunstmann maps (Cortesao 1960, v.
That latitude deviation in the Americas was corrected in the 1527 map of Maggiolo and the Weimar planispheres of 1527 and 1529 (Kohl 1860, p.
After 1525 neither cabo de lago nor cabo alto appear on maps that reflect the Padron real: the Weimar (1527) or the Weimar (Ribeiro, 1529) planispheres.
The early planispheres of the world do not give a western coast for South (or North) America.
365-648) and also periodically integrated into an overall matrix (or mother) planisphere map of the world (Seville: Padron real).
The Portuguese padrao map is still known in copies and derivatives like the Cantino manuscript world map (1502), King-Hamy planisphere of 1504, Nicola Caveri (or Caverio) of c.
Learning your way around is not something you can easily be taught but using your planisphere or smartphone app, you will be soon zipping around the sky.
Just as on a modern planisphere, the diurnal passage of the stars is reproduced by rotating the projection, and so as the rete is rotated clockwise, stars are seen to rise in the east and set in the west.
As is the case with a planisphere, the projection must be brought into the correct rotation to represent a particular time and date before it can be used.