Is the first day of the 120th Jubilee at the start of 2030? Or, is 2030 within the 120th Jubilee year but not necessarily at the very beginning?
How do we know we are in the 120th Jubilee?
Is it also the 50th year of the last Jubilee cycle?

The Essenes Predicted Over 2000 Years Ago Mankind will enter its Final Jubilee in 2025

@Christ is King

There are two schools of thought.

1) Logic would dictate that creation began on the first day of the first month and thus the Jubilee year is announced on Yom Kippur six months earlier to give God's people time to prepare for the release of servants and the redistribution of land (Leviticus 25:9). It also makes sense that the Jubilee year beings when we are told that a Biblical year beings.

2) Jewish tradition places creation in the seventh month of the year and this is when the Jubilee year starts. This could also make some sense because Messiah will return in the 7th month and also bring us into the land at that time.

We expect option 1 is the most likely.

How do we know we are in the 120th Jubilee?

We review that in part 1 and part 2.

Is it also the 50th year of the last Jubilee cycle?

Yes