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6. Kiddush Levana:[1]

The custom is to delay saying Kiddush Levana until Motzei Yom Kippur.[2] See our Sefer “The Laws and customs of Motzei Shabbos” “Kiddush Levana” Halacha 6!

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[1] Rama 426:2; 602:1; Levush 602:2 that so is the custom; M”E 602:46; Sefer Haminhagim p. 126 [English]; Mishmeres Shalom 41:1; Seder Hayom; See Otzer Minhagei Chabad p. 249; omitted from Admur 602 Vetzaruch Iyun!

Other Opinions: Some Poskim rule that one is specifically to say Kiddush Levana prior to Yom Kippur, as perhaps this merit of saying Kiddush Levana will turn the judgment to the side of good. [Gadol brought in Levush 602:2; Elya Raba 602:7; Beis Meir 426; Biur HaGr”a 602; Chida in Moreh Baetzba 9:283 and other Poskim brought in Kaf Hachaim 426:27; 602:19; M”B 602:10; Biur Halacha 426 “Velo Kodem Yom Hakippurim”; Makor Chaim 602; Nemukei Orach Chaim 602; Alef Lamateh 602:25; See Otzer ibid]

[2] The reason: It is not to be said before Yom Kippur because one is in a state of pain due to it being a time of forgiveness of sin. [M”A 426:5] Others write as follows: It is not to be said as one is in a state of seriousness due to the days of Judgment and he is thus not in a state of joy which is required for the recital of Kiddush Levana. [Levush ibid in name of Gadol; M”B 426:9]