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This is a simple algebra problem. The Sun has a diameter of 1,390,000 km, and the Earth has a diameter of 12,756 km. If I'm making a model of the Sun that is 1.26 meters in diameter, what should the diameter of the model Earth be?

So, 12756/1390000*1.226 = 0.0112509755 meters, or 1.125 cm.

So, if the sun-model is 1.26 meters, about the size of a bicycle wheel, then the earth-model is about the size of a pea.

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Q: If the sun is 1.26 meters how big is the earth?
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