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Sefira Counting in Diaspora

How do we count sefira with absolute certainty, as we do, and yet, in diaspora, we have a second seder and a second day of yom tov? Wouldn't the lack of certainty imply that we don't know which night of sefira it is? If so, why don't we count twice every night? Or hold only one day of yom tov?

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marked as duplicate by yydl, Double AA, Isaac Moses Apr 9 '12 at 1:58

This question was marked as an exact duplicate of an existing question.

We know with certainty, ever since the fixed calendar was established; yom tov sheni is kept because of tradition, not uncertainty.

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What about back in the day? – Baal Shemot Tovot Apr 9 '12 at 1:24

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