Genesis 1:14

For signs. Not to countenance the delusive observations of astrologers, but to give notice of rain, of the proper seasons for sowing, &c. (Menochius) --- If the sun was made on the first day, as some assert, there is nothing new created on this fourth day. By specifying the use and creation of these heavenly bodies, Moses shows the folly of the Gentiles, who adored them as gods, and the impiety of those who pretend that human affairs are under the fatal influence of the planets. See St. Augustine, Confessions iv. 3. The Hebrew term mohadim, which is here rendered seasons, may signify either months, or the times for assembling to worship God; (Calmet) a practice, no doubt, established from the beginning every week, and probably also the first day of the new moon, a day which the Jews afterwards religiously observed. Plato calls the sun and planets the organs of time, of which, independently of their stated revolutions, man could have formed no conception. The day is completed in twenty-four hours, during which space the earth moves round its axis, and express successively different parts of its surface to the sun. It goes at a rate of fifty-eight thousand miles an hour, and completes its orbit in the course of a year. (Haydock)