Talmud for Rosh Hashanah 47:19
<big><strong>גמ׳</strong></big> ומי שרי והכתיב (שמות כ, כג) לא תעשון אתי לא תעשון כדמות שמשיי
Rab Judah said in the name of Samuel: The halachah is as laid down by R'Eleazar B'Zadok. Abaye said: We have also learnt to the same effect: 'If the Beth din and all Israel saw it,<span class="x" onmousemove="('comment',' On the thirtieth day.');"><sup>21</sup></span>
Jerusalem Talmud Rosh Hashanah
“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..
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