תלמוד על ראש השנה 47:10

“To its North or its South?” There are Tannaim who state, “to its North” his words are accepted. There are Tannaim who state, “to its South” his words are accepted. He who said, “to its North” his words are accepted, from Ṭevet to Tamuz; he who said, “to its South” his words are accepted, from Tamuz to Ṭevet⁹¹The Babli 24a makes the changeover at the equinoxes, not the solstices. Ptolemy’s solar and lunar tables make such general statements unnecessary..