Rosh Hashanah

Definition and stakes

Translation:Mishnah, — Seder Moed…

“ The fast: i.e. Tisha B'Av
Because of Rosh Hashanah: As Rosh Hashanah is the first of Tishrei and is celebrated for two days everywhere (even in the land of Israel) just to be safe, the date of Rosh Chodesh Elul needed to be declared so that Jews in the diaspora could observe in unison with Israel.
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Source: Wikisource

Yosef Karo,  Translation:Shulchan Aruch — Orach Chaim 584…

“ Shulchan Aruch Orach Chaim 584 Torah Reading for Rosh Hashanah
סדר קריאת התורה בראש השנה:
584:1 We do not say Hallel on Rosh Hashanah or Yom Kippur. Rem"a: We have the practice of saying all of "Our Father our King." If it is Shabbat, we do not say it (Ra"n chapter 2 of Rosh Hashanah and Rivas"h chapter 512) . We continue with piyyut and prayers until noon (Mahari"l) .
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Source: Wikisource

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