Lot #: 17488

Two sheets for constructing an armillary sphere.

Maker / Publisher:		CASSINI, G.M.
Place & Date:		Rome, 1795
Colored:		In original colors.
Size:		390 x 410 mm / 15.4 x 16.1 inches
Condition:		Two sheets. Very good condition. Dark impression. Wide margins.

$2700 / ≈ €2377

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Description

Two sheets for constructing an armillary sphere. Cassini was a geographer and cartographer, but also perspective and architecture carver - one of Giovanni Battista Piranesi's best disciples - Cassini was one of Italy's last globe-makers in the XVIIIth century. His globes enjoyed widespread success as too did his Nuovo Atlante geografico delineato sulle ultime osservazioni, published in Rome from 1702 until 1801.

An armillary sphere is basically a skeletal celestial sphere with a model of the Earth or, later, of the Sun placed in the center. It is useful as a teaching tool and as an analog computer for solving various astronomical problems to a crude degree of accuracy.

Armillary spheres were developed by the Greeks in antiquity for use as teaching tools. In larger and more precise forms they were also used as observational instruments, being preferred by Ptolemy.

The Armillary sphere consists of two major components, the sphere and the stand. The heart of the Armillary sphere is the sphere itself, which was often made and used alone.

The central body in the sphere represents the Earth, which was, of course, considered the center of the Universe. The colures and the Equator (the rings defining the sphere) represent the firmament, that is, the sphere upon which the fixed stars reside.

The band going around the sphere, at an angle to the equator, represents the zodiac. The line running through the middle of this band defines the ecliptic. The width of the band is ideally about ±9° to include the wandering of the Moon and planets above and below the Sun's path. The various constellations of the Zodiac also fall along with this band.

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Color Key
We offer many maps in their original black and white condition. We do not systematically color-up maps to make them more sellable to the general public or buyer.
Copper engraved or wood block maps are always hand colored. Maps were initially colored for aesthetic reasons and to improve readability. Nowadays, it is becoming a challenge to find maps in their original colors and are therefor more valuable.
We use the following color keys in our catalog:
Original colors; mean that the colors have been applied around the time the map was issued.
Original o/l colors; means the map has only the borders colored at the time of publication.
Colored; If the colors are applied recently or at the end of the 20th century.
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Paulus Swaen maintains an archive of most of our high-resolution rare maps, prints, posters and medieval manuscript scans. We make them freely available for download and study. Read more about free image download	Click this image for a free HR-image download. Two sheets for constructing an armillary sphere.

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