Should I wait for the 7th night of the month before saying birkat halevana? Should I wait until Saturday night? When’s the earliest I could say birkat halevana?
There’s no need to wait 7 days to say the blessing on the Levanah. As soon as you see the new moon you can say the blessing. It usually takes a couple of days before you can see.
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The Shulchan Aruch says to wait 7 days and the Achronim say to wait 3 days.
Is this a third opinion?
Here is what Rav Chaim Kanievsky z"l wrote about what he observed from the Chazon Ish.
Also, see the אור יצחק חלק ב’ סימן קצ"א below
Fascinating Teshuvah! What’s the bottom line?
The Rabbi would say it at the earliest time and never waited until a specific number of days…