This Armillary Heliocentric Sphere is a scientific instrument that was used to demonstrate the heliocentric model of the solar system, which places the sun at the center of the universe. The sphere was created by French cartographer and globe maker Charles-Francois Delamarche in the last quarter of the 18th .; The Earth Orbc in the form of C contains a small Earth connected to the Sun by a mechanism with pulley to maintain its constant inclination throughout its revolution around the Sun. The two outer vertical circles represent the colure solstices and equinoxes, the outer horizontal circle is the ecliptic.In 1780, only 6 planets of the solar system were known. They are Mercury, Venus, Earth, Mars, Jupiter, and Saturn. Uranus, the seventh planet, was not discovered until the following year in 1781 by Sir William Herschel , it place the year of production late 18th early 19th. since there is 6 planets represented only , the red trim is indicative of a Charles Delamarche mount.; H.19 in x D. 11 in , cleaned , good conditiuon , the moving mecanisn around the sun is in working condition , well preserved Delamarche piece.; There is a similair piece illustrated page143 in the book of " the collection of antiques globes in the Steward museum of Montreal "Edward H. Dahl (Author), Jean-François Gauvin (Author); La Découverte du monde : Une histoire des globes terrestres et célestes October 18, 2001; The authors get to same conclusion in regard to the time of production .

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