[awr' ur E] a working model of the solar
system as seen from the "outside"
Simple orreries typically show
no planets other than the Earth revolving about
the Sun plus the Moon revolving around the Earth,
but more complex models include all known
planets, and some may even show the moons
revolving around those planets. The first known
planetary machines were made by London clockmaker
George Graham between 1704 and 1709. The first
planetary machine to be called an orrery was made
by another London clockmaker, John Rowley, who
made one for Charles Boyle, 4th Earl of Orrery
(for whom he named the device).