In the early centuries of astronomy, however, our visions of the cosmos often took the shape of diagrams—representing what we believed about our solar system. What’s remarkable about Claudius ...

This is the purpose of this diy solar tracker system or if you have an Arduino board then you can build this one that uses a servo. The solar tracker circuit uses a window comparator to maintain the ...

But it is the diagram that he draws at the beginning of the book that captures in a simple image his revolutionary new idea: it is the Sun that is at the centre of the Solar System, not the Earth.