12/08/2026
‘What's it? Wednesday
Since lots of us have been involved in solar and astronomical events this evening, you may have heard some technical terms that you wondered ‘What is it?’.
We heard ‘orrery’ and said just that!
What is it?
An orrery is a mechanical model of the Solar System.
It was designed to show how the planets move around the Sun. It is operated by turning a handle or winding a clockwork mechanism, making the little planets travel round their orbits.
Around 1713, John Rowley, an instrument maker made one of the first known examples for Charles Boyle, 4th Earl of Orrery. The instrument itself ended up being named after him.
Orreries were particularly fashionable in the 18th and 19th centuries. They were used in education, for astronomical demonstrations and collected by wealthy enthusiasts.
They can sometimes be found labelled ‘Clockwork Solar System’ and, although surviving antique models in high end shops tend to be elaborate, with lots of planets, some early orreries were less elaborate and showed just the Sun, Earth and Moon.
Seen one?
You can look directly at these! 👀