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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The Sun's diameter is approximately 1,391,000,000 meters in length, which is over 100 times the approximate diameter of the Earth (12,756,200 meters).
About 150 million km, or 150,000,000,000 meters.
1391000000 meters
1,416,213,920 meters across
The sun is 1.4e27 meters cubed