We have seen from our earlier calculations that the diameter of the Earth in the model is scaled down to 82.5 millimetres. That's about the size of a large orange.

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That scaled-down diameter is derived from the calculation that 1 kilometre in reality is represented by 0.00647 millimetres on the model. 

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That same calculation is used to determine the diameter of all of the other planets in the model. As the Earth's moon is such an important part of our view of the solar system, the Moon is also included in the model.

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