Another thing, day by day. Rabbi Yochanan said, "When the elders pass from one year to the next, they subtract from the day and add to the night. They subtract from the night and add to the day. How does this work?
There are four seasons in the year: Nisan, Tammuz, Tishrei, and Tevet. From Tevet until Nisan, the night is longer than the day. From Nisan until Tammuz, the day is longer than the night, with one out of every thirty hours borrowed from the night. From Tammuz until Tishrei, the night is longer than the day.
From Tishrei until Tevet, the day is longer than the night, with one out of every thirty hours borrowed from the day. During Nisan and Tishrei, they owe each other nothing, and they borrow and repay from each other with no witnesses or court, and their conduct is not like human behavior regarding debt repayment. We do not say, 'There is no such thing.' However, below the elders, we subtract from the day and add to the night, and subtract from the night and add to the day, with no objection.
When they leave the assembly, throughout the land, there is a great commotion. They ask, 'When is Rosh Hashanah? When are the holidays?' And their fame reaches the ends of the world. How many months and how many seasons?"