All the constellations serve the Molad of the moon and also the generations of the children of men; upon them the world stands, and everyone who is wise and understands, he understands the Molad of the moon and the generations of the children of men, and concerning them the text says, "And let them be for signs, and for seasons" (Gen. 1:14). The signs of the hours shall not depart from serving the sun by day and the moon by night.
In three cycles of the sun or in four cycles of the moon there are 84 years, which are one hour of the day of the Holy One, blessed be He. When the sun and moon become equal at the beginning of the eve of the fourth day and at the hour of Saturn in the hour when they were created, and in the hour when the flames of the moon reach the sun by day at the degree (or ascent) of 60 (degrees), it passes therein and extinguishes its light; and in the hour when the flames of the sun reach the moon at night in the degree (or ascent) of 40 (degrees), it passes through it and extinguishes its light.