A calendar based on the movement of theEarth and theMoon around theSun, which defines theyear.
2024, David Golinkin, “What Is The Purpose And History Of Adar II”, inResponsa in a Moment, volume 4, page88:
We adopted the Babylonianlunisolar calendar in order to make sure that Pesaḥ fell in the spring, Shavuot at the first fruits, and Sukkot at harvest time.
2026 February 16, Alicia Eler, “Lunar New Year, Ramadan and Lent in rare alignment this year. The holidays follow different solar and lunar calendars, but some of them sync up in 2026”, inMinnesota Star Tribune[1], archived fromthe original on16 February 2026:
The holidays are all happening within two days this year because several long solar, lunar andlunisolar calendar cycles sync up.