DALLASI absolutely love this, it's called an orrery, and it's a little mechanical model of our solar system. You can see the planets here, orbiting the sun as they would do in real life.

The novel methodology was introduced in the study “A spatio-temporal decision-making model for solar, wind, and hybrid systems – A case study of Saudi Arabia,” published in Applied Energy.

An Egyptian astronomer called Ptolemy (AD100-168) described one of the earliest ideas for how the Solar System is structured. Ptolemy’s model and many earlier ideas of the Solar System had the ...