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Why is aleinu said twice: once at the end of Maariv, and then again at the end of Kiddush Levanah?

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related: judaism.stackexchange.com/a/136/603 –  Menachem Jun 24 '12 at 22:58

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First Because we say:

שֶׁהֵם מִשְׁתַּחֲוִים לְהֶבֶל וָרִיק וּמִתְפַּלְּלִים אֶל אֵל לֹא יושיע

  • That is we are illustrating the Idol worshipers pray to heavenly bodies but we do not. (Likutie Maharich,Chelek Beis,Daf Kuf)
  • Aleinu, was written by Yeshouah Ben Nun he was compared to moon. That is the Gemara in Baba Basra (75a) says:

The face of Moshe was Like the sun,Yeshouah was like the Moon.

Therfore the comparison compels us to say Aleinu at Kiddush Levanah.

Source:Rite and reason: 1050 Jewish customs and their sources

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Not facing the moon is not lidivrei hakol. The Kneses Hagedolah bringd down to look at the moon while saying the bracha. this indicates that he has no problem with being turned towards it. The Mishnah berurah objects to gazing at the the moon for the bracha based on the kabbalistic considerations of the Shelah but does not discuss facing towards it. Even though we do not pasken like the Kneses Hagedolah there are many who have the minhag to say kiddush levana while turned towards the moon. –  Yahu Jun 20 '10 at 18:18
Also, if the minhag is to be faced towards the moon for birchas halevana it then makes sense that we should declare Aleinu to clarify what we just did. If one faces away, it is sort of obvious that he is not praying to the moon! –  Yahu Jun 20 '10 at 18:20
Are you quoting the likutei mahariah as saying one should not face the moon while saying birchas halevana? –  Yahu Jun 20 '10 at 18:59
Actually, Likutei Maharah implies that we do face the Levanah and that is why it is important to say Aleinu afterwards. I have yet to find a source that says not to be facing the moon when saying Birchas HaLevana! –  Yahu Jun 20 '10 at 19:54
And I have seen many Talmidei Chachamim and Gedolim who face the moon for it. I have asked Gedolim about this turning away practice and some said they never heard of it and others said it is a new humrah with no real reason in Halacha. –  Yahu Jun 20 '10 at 20:01

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