Volvelle Translation
Part Two- Appendix
But in which manner, by use of this instrument to perceive the equal hours by the rays of the moon. In order to find each hour by the configuration o f the dial of the moon, observe carefully the moon in the sky, from which greatness, which proof of good watch proceeds the sun. The certain things known by placing the laws of the moon within the circle of hours (time) by the hour which the compass proves (shows). This would prove, from the turn of the wheel, from the direction of the moon, by a certain number, that the sky by looking at the symbols and reflecting on that which you find. From the configuration which will show the hour requested by the circle of hours. The answer comes by the observation of the circle.
By the moon, which has the slightest light, derived from the light when the world is reflected always remains of half full. The half body of the moon is slanted. With a little more lumination the system derives the communication and gives the light to the moon and to other stars.
But the other half, by the obscurity of the body, would always eclipse. But at the appearance of our old beliefs by each moon ray, the moon joins in sequence with the sun, then after transfiguring the twelve signs of the zodiac, there is the conjunction of the sun. Therefore the quantity of light has proved our knowledge of each day by this manner (system), in the joining when nothing is seen but by then the part of the moon which has reflected toward us, has then enflamed the sun. The lesser part (which shows in a figure of black or pale color) for the splendor of the moon. After all that reflects from the sun, so much to believe, shows from the radiation, whose turn glows in the solar system indefinitely.
General Rule
The moon holds belief in the sun, and after the sun sleeps under the horizon, the part illuminated rises in the west but the moon does then proceed the sun and fades in time for the morning.
The half in turn or with movement sets toward the east, by always (in order to say everything briefly) the half illuminated always faces toward the sun.
-Translated by Heather Galbraith.