The Ten Books on Architecture, 9.2.1

Vitruvius  translated by Joseph Gwilt

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2Berosus, who travelled into Asia from the state or country of the Chaldeans, teaching his doctrines, maintained that the moon was a ball, half whereof was luminous, and the remaining half of a blue colour; and that when, in its course, it approached the sun; attracted by the rays and the force of the heat, it turned its bright side in that direction, from the sympathy existing between light and light; whence, when the sun is above it, the lower part, which is not luminous, is not visible, from the similarity of its colour to the air. When thus perpendicular to the sun’s rays, all the light is confined to its upper surface, and it is then called the new moon.

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