NUM345 Bring a musaf offering on every first of the month. As it is known, the Creator vested the moon and the sun with power to influence the physical world, the bodies of people, animals and all plant life. For this reason, at the time of the renewal of the moon, people refrain from acts that are potentially dangerous, such as setting out to sea or letting blood. At the time of the renewal of the moon, since the moon exerts such influences, it is fitting that we, too, do something new and different from what we do on other days, and it is most appropriate to bring additional offerings to honor Hashem. This way, we take to our hearts that all changes in the world and new phenomena are from Him exclusively, and so, too, every influence exerted on the world by the celestial bodies. When this pure and true thought occupies our minds, our souls are elevated, and Hashem's blessings descend upon us.