What are the Halachic parameters and definition of a neis nistar versus a neis nigleh?

For example: I heard recently from a Rav that one reason brought not to say hallel on Yom Ha’atzma’ut is that even though (the reason-giver believes) there was a neis on Yom Ha’atzma’ut, we don’t say hallel because the neis was “hidden”.

So what exactly is a neis nistar?

  • I’m having a hard time finding good tags for this question as there is no “neis” or “Nissim” rag, and as I’m on a cellphone I can’t create one. So if someone could edit those in I’d be grateful.
    – Lo ani
    Jul 2 '19 at 18:30
  • Better sourcing that this category is actually Halakhically relevant would improve this question
    – Double AA
    Jul 2 '19 at 18:31
  • Sounds like a bit strange reasoning. It seems that neither Rosh Hodesh, Shavuot or Succot involved revealed miracles. Yet, we say Hallel on those occasions.
    – DanF
    Jul 2 '19 at 19:36
  • 1
    Re tagging - it seems hat the focus of your question is more on the parameters on when we say Hallel, not the definitions of the two types of miracles.
    – DanF
    Jul 2 '19 at 19:38
  • 1
    @Loani Did the rav give a source? Can you ask him? It's probably the most direct way to find out what he meant.
    – WAF
    Jul 3 '19 at 4:24

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