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From 2017 you count back exactly 600 years to get the Jubilee year (1416-)1417. The one after that was (1466-)1467. Start with a known Jubilee year, add or subtract 7 and that's a Sabbatical year. Keep doing that until you've done it 7 times. The year before or after that is a Jubilee year. Since adding or subtracting 7 repeatedly from 1417 can be a pain, use a calculator and make a chart. I haven't seen one already made.
Rosh Hashanah marks the beginning of the year because it is held on the traditional anniversary of the creation of Adam and Eve. Rosh Hashanah marks the start of a new year in the Hebrew calendar (one of four "new year" observances that define various legal "years" for different purposes as explained in the Mishnah and Talmud). It is the new year for people, animals, and legal contracts. The Mishnah also sets this day aside as the new year for calculating calendar years, shmita and yovel years.
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What are you talking about??? How are we off by 40 years? Please elaborate.