In the de Sola Pool Daily Siddur, page 361, it reads: "Blessing of the moon. Recited standing out of doors on Saturday night in the second week of the lunar month." Why is this the case? Is this because the S&P follow the custom of waiting on the 7th day? What is the history of this practice? Do we know?I did some searching and I found that the Peninei Halacha quotes the pratice of waiting to the seventh day and attributes it to the kabbalists. He writes, "According to some of the greatest Kabbalists – most notably, *R. Yosef Gikitilla* – one should wait seven days, for esoteric reasons. They explain that the renewal of the moon’s light alludes to man’s renewal, and whenever there is a new development, there is concern that the Attribute of Justice might prosecute and hinder the new growth. Therefore, it is proper to wait seven days, like the seven days of Creation, for by then the moon’s light has stabilized and the Attribute of Justice can no longer wage war against the new beginning." Is this the reason for the S&P pratice?