Shown below are 20th century armillary spheres and sundials recently added to our inventory.
If you are interested in purchasing one of these and need additional information,please inquire.
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An Armillary Sphere is an instrument that is generally used as an astronomical demonstration device or sundial. Typically armillary spheres have concentric rings to indicate planetary orbits and/or terrestrial and celestial measurement circles, and a zodiac band. We feature a large selection of armillary spheres, both Copernican, with the sun at the center, and Ptolemaic, with the earth at the center. We also feature metal sundial armillary spheres, each generally with a central arrow. Armillaries are made from a variety of materials, including brass, iron, wood, and pasteboard with applied paper calibrations. Our current selection is shown above, with concise information about each. For more information please contact the gallery
A Ptolemaic Armillary Sphere has an earth globe at the center. It is named after Ptolemy, an astronomer of ancient Greece who popularized the geocentric theory of the universe that the sun and planets revolve around the earth. In a Ptolemaic armillary sphere, the central globe is surrounded by an equatorial circle, as well as circles for the tropics of Cancer and Capricorn and the Arctic and Antarctic poles. These in turn are surrounded by a zodiac band, all within a meridian (with which the sphere can be rotated) and a stationary horizon band, on a stand, generally with central baluster and round base. Although the name of the Ptolemaic armillary sphere implies that it shows the geocentric theory of the universe, this device does not include the sun or other planets. In our opinion, it was more likely designed to show the positions of the constellations on the zodiac band relative to the “apparent path” of the sun (the zodiac band is positioned on the ecliptic), and to show the position of the earth relative to the other circles in which it is set.
A Copernican Armillary Sphere has a sun ball at the center. It is named after Nicolas Copernicus who popularized the heliocentric theory of the universe that the sun was the center of the universe, and the planets revolve around it. In a Copernican armillary sphere the central sun is surrounded by a series of concentric rings representing the planets (and sometimes asteroid belts) that revolve around the sun. Generally the earth is shown in an opening in the third circle as a sphere, with a small revolving moon. These planetary circles are surrounded by a zodiac band (set as a flat band at the center), and solstice and equinox circles, on a stand, generally with central baluster and round base. This arrangement resembles an orrery on its side; indeed sometimes Copernican armillary spheres contain an orrery with small round or disc planets on rod arms that are moved by hand.
A Sundial Armillary Sphere is made for a garden to tell time by the shadow made from passage of the sun during the day. It is like a simple form Ptolemaic armillary sphere, but with central arrow rather than earth sphere. The zodiac band is calibrated on the inside with daylight hours, and the arrow serves as a sundial gnomon to cast a shadow on the zodiac band to indicate time. The whole is set within equatorial and meridian circles and raised on a stand, often of an atlas figure supporting the sphere. Other stands include a zodiac pyramid, seahorse, baluster, etc. Sundial armillaries were generally intended for garden use and designed so that the base can be bolted into a larger heavy support, such as a columnar garden pedestal. Exterior examples are often used for interior use with a smaller decorative base. Indeed, some sundial armillaries are not weather-proof for garden use; they were intended solely for interior use as decorative objects.