Shalom.
Today is Rishon, 12-17.
Tishrei is the seventh month on the Jewish Calendar that has Babylonian month names. This is not the first Jewish Calendar. Nor is it seen as correct or to be observed by all. Some people observe it in addition to the Jewish Calendar originating in the Torah.
Shalom.
Jacob
Yes I think we did talk about this. Originally Tishri was month one:
Exodus 12:1-2
1 The LORD said to Moses and Aaron in Egypt, 2 This month
is to be for you the first month, the first month of your year.
This tells us that God was making Aviv the first month of the religious year. Present day Jews believe Tishri, now month seven, was originally the first month of the actual year and this is also shown in the Bible:
Exodus 34:22
“Celebrate the Festival of Weeks [Shavuot/Pentecost] with the first fruits of the wheat harvest, and the Festival of Ingathering [Tabernacles] at the
turn of the year.”