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Rav Menashe Klien was asked if one can say kiddush levana on the moon if they are physically on the moon. He answers in his Mishne Halachos 6:259 that there is no difference standing on the moon or earth with regards to saying kiddush levanah. He then writes that going to the moon altogether should be prohibited for two reasons 1) the travel to the moon is ...


Astrology is listed as part of prohibition #335 in the list of mitzvot here: Not to practice onein (observing times or seasons as favorable or unfavorable, using astrology) (Lev. 19:26) (CCN166). However, some sources including the Ein Yaakov disagree that astrology falls under the prohibition of me'onein; see here.

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