Chapter 56: On the motion of the moon

1. The moon governs the times by alternately losing and recovering its light. It advances like the sun in an oblique, and not a vertical course, for this reason, that it may not be opposite the center of the earth and often suffer eclipse. For its orbit is near the earth. The waxing moon has its horns looking east; the waning, west; rightly, because it is going to set and lose its light.