Mi Yodeya is a question and answer site for those who base their lives on Jewish law and tradition and anyone interested in learning more. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

The Torah seems to have many examples where astrology is deemed real. (such as the astrology predictions that Moshe would be struck by water which made Paraoh throw the jewish males in the nile river. Or the midrash that says Avraham could see through astrology that he would not have children.)

What does Judaism say about the efficacy of astrology? Do Jews believe that astrology is real, or that it is just a bunch of coincidences?

share|improve this question
"The official Torah position" what does that mean? – Double AA Jul 12 '13 at 8:29
the majority opinion from the reliable sources – Gizbar Jul 12 '13 at 8:38
That's quite a non traditional definition – Double AA Jul 12 '13 at 12:07
@msh210...he says pretty clearly that the Torah apparently deems it real, not that the Torah says so definitively. – Yirmeyahu Jul 12 '13 at 20:54
@DoubleAA, ado you take issue that there is an "official Torah position" on anything and if not what is the problem if the questioner asks if ther is such a position on this topic? – Yirmeyahu Jul 12 '13 at 20:56
up vote 5 down vote accepted

Definitely it is real. See Masheches Shabbas 156: go through the whole gemara there, starting with where it says "Rabbi Yehoshua Ben Levi". It indicates that the day and time of someone's birth can affect him, though that there is a dispute as to whether Israel is affected by it.

share|improve this answer
Just because it is in the gamoro doesn't mean it is really that way. – MoriDoweedhYaa3qob Jul 14 '13 at 2:03
Please explain,don't know what you mean? – sam Jul 14 '13 at 2:32
rambam says that in the gamoro's times people followed the sciences and the ideas of the time. astrology was a big part in that time period. however, it does not mean that astrology is true. – MoriDoweedhYaa3qob Jul 14 '13 at 4:45
Much like people in the Rambam's time following him, because that was the informant they had, even though he wasn't necessarily right. – user6591 Apr 26 '15 at 4:19
Sam, it is problematic to say "definitely" about subjects that are in dispute, especially when it comes to matters of believe. As the Rambam said in his commentary on the Mishna on Senhedrin 10:1, if we see that there are two opinions amongst our sages we cannot say that one is "definitely" correct and that the other one is wrong or heretic. We can only say with whom we agree and why, but we can't force our views onto others and claim that they are the only correct opinion. – yechezkel Apr 27 '15 at 11:25

See Does the Zodiac really have influence on our lives? where the view of the Rambam in his letter on astrology is discussed. To summarize, Rambam is of the opinion that astrology is ineffective and that sages who appear to have believed in it were either mistaken or speaking non-literally.

share|improve this answer

Like any serious question in Judaism, there is a Machloket. The Gmara clearly believes in astrology and that many thing are an affect of a mans Mazal.

אמר רבא חיי בני ומזוני לא בזכותא תליא מילתא אלא במזלא תליא מילתא

(Moed Katan 28a) This include חיי בני ומזוני, how many years a man will live, how many children will he have, and how much money. Yet there is a Machloket (shabbat 156a) if יש מזל לישראל or not.

Most of the Rishonim and Achronim agree that astrology is an integral part of Judiasm. But they disagree if אין מזל לישראל means that they are completely unaffected by astrology or rather thay too are affected, but that they can use prayer to change their Mazal. See Abarbanels commentary on Deut. 4. And the Mepharshim on shabbat 156a-b.

As with many mystic believes, the Rambam did not believe or support the idea of astrology in Judaism. In a famous letter to the sages of מארשילייא the Rambam called astrology "beliefs of the fools" and claimed that we have no obligation to believe in it, since only a Daat Yechid speaks of it in the Gmara, and philosophy (science) has proven it to be nothing but superstition. Obviously, the Rambam was highly criticized for this, but never the less it is still a legitimate view.

When it comes to Halacha, it seems that the rule is that astrology is real, and that יש מזל לישראל. for an example to this, the Halacha is that a woman that two of her husbands died (even if not from a natural cause) cannot remarry since we say that her Mazal caused her husband's to die. Here is the Pask of a Biet Deen in Israel.

share|improve this answer
re a woman whose two husbands have died, it is interesting to note that this is a dispute in the gemara itself (Yevamot 64b), between Rav Huna (natural) and Rav Ashi (mazal), with the ramifications you mentioned. While mazal is the view of most poskim, the Rambam and Tur say like Rav Huna in this matter. he.wikisource.org/wiki/… – josh waxman Apr 27 '15 at 11:13
@josh waxman true, that's why I included the Psak Biet Deen to show what happened in an actual real situation. – yechezkel Apr 27 '15 at 11:14
true. though that is one bet din, which I would not then necessarily take to be the definitive rule when it comes to halacha. thus, i could well imagine poskim, especially from different ideological backgrounds, finding a heter for a marriage if the man or woman sent a shayla. – josh waxman Apr 27 '15 at 11:28
@josh waxman true. Basically in every case where astrology or mysticism affected Halacha, the Rambam differed from the other Poskim, and by doing so gave us an opening to Pasken like him. – yechezkel Apr 27 '15 at 11:31
@josh waxman from the Aruch haShulchan you linked you can see that he claims that Israel isn't under the control of the Mazal אין מזל לישראל, but that the other nations are. The Rambam was (as far as I know) the only one to claim that the entire idea of astrology is false. – yechezkel Apr 27 '15 at 11:39

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.