Rosh Hashanah 30: Preventing Mistakes and Greater Mistakes

More of R. Yochanan ben Zakkai's decrees. Lulav, Yom Henef (Omer). The changes are made to remember the Mikdash, but how is that allowed to begin with? There's a verse for that. Also, the witnesses on Rosh Hashanah have far more complications than the usual Rosh Chodesh. Including the special psalms as sung by the Levites. And, of course, the daily sacrifices. When they accepted the witnesses all day long, there was too much risk of error. Which happened.