What is an orrery?
Q: What is an orrery?
A: An orrery is a mechanical model of the Solar System.
Q: What does an orrery show?
A: An orrery shows the relative positions and motions of the planets and moons in the Solar System.
Q: Is an orrery heliocentric or geocentric?
A: An orrery is usually heliocentric.
Q: Who had working planetaria?
A: The Greeks had working planetaria.
Q: When was the first orrery of the modern era produced?
A: The first orrery of the modern era was produced in 1704.
Q: Who was presented the first orrery?
A: The first orrery was presented to Charles Boyle, 4th Earl of Orrery, hence the name.
Q: What is the globe in the centre of an orrery?
A: The globe in the centre of an orrery represents the Sun, with a planet at the end of each arm.
Q: What was the first known orrery?
A: The first known orrery was the Antikythera mechanism, which was produced between 60 and 150 BC.
