What is a pyramid? K-6 Geometry made simple and straight forward.
SWISS GILT BRONZE CLOCK-TOP ORRERY BY FRANÇOIS DUCOMMUN, CA 1810 A gilt bronze heliocentric clock-top orrery with central sun, orbited by Mercury and Venus, and with orbiting Earth and moon, rotating year calendar with coloured enamel plaques depicting the signs of the zodiac, with removable bell-jar cover (12 inches tall with jar); the whole mounted on a 8 1/4 inch diameter wooden base. Orrery driven by and ivory hand-crank found at side of base. Come chips to edge of bell jar. SOLD.37,500 USD Axial Tilt, Asteroid Belt, Time Keeper, The Bell Jar, Bronze, Antique Clocks, Meteorite, Milky Way, Astronomy
