Labels:text | screenshot | font OCR: and each in its own sphere concentric with the earth at the center of the world. Leonardo believed that the moon has an atmosphere and a nature similar to those of the earth and, therefore, the same physical laws. The diagram crossing the middle of the page C helps to show that the moon's surface has substance and weight. The question that concerns Leonardo is whether the moon is heavy enough to keep the watery sphere at its surface from falling away to the
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