גמ׳ אמר רב חנן בר רבא קלנדא ח' ימים אחר תקופה סטרנורא ח' ימים לפני תקופה וסימנך (תהלים קלט, ה) אחור וקדם צרתני וגו'
GEMARA: Rav Ḥanan bar Rava says: When are these festivals celebrated? Kalenda is celebrated during the eight days after the winter solstice, and Saturnalia is celebrated during the eight days before the winter solstice. And your mnemonic to remember which festival is that the one that occurs after the solstice is mentioned first in the mishna, and the festival that takes place before the solstice is mentioned after, as in the verse: “You have hemmed me in behind and before, and laid Your Hand upon me” (Psalms 139:5), where the word “before” appears after the term “behind.”