Siman 601
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א בְּיוֹם שֵׁנִי מִתְפַּלְּלִים כְּמוֹ בְּיוֹם רִאשׁוֹן (טוּר), וְקוֹרִים מִוְּהָאֱלֹהִים נִסָה אֶת אַבְרָהָם עַד סוֹף סִדְרָא, וּמַפְטִיר קוֹרֵא כְּמוֹ אֶתְמוֹל וּמַפְטִיר בְּיִרְמִיָּה (יִרְמִיָּה לא, א) כֹּה אָמַר ה' מָצָא חֵן בַּמִּדְבָּר עַד הֲבֵן יַקִּיר לִי אֶפְרַיִם; וּבְמוֹצָאֵי רֹאשׁ הַשָּׁנָה מַבְדִּילִין כְּמוֹ בְּמוֹצָאֵי שַׁבָּת, אֶלָּא שֶׁאֵין מְבָרְכִין עַל הַבְּשָׂמִים וְעַל הָאֵשׁ.
1 The order of the 2nd day of Rosh HaShana and in it is 2 paragraphs On the 2nd day (we pray like the 1st day) (Tur) and we read from "And God tested Abraham" (Bereshis 22:1) until the end of the portion (Bereshis 22:24). The Maftir reading is the same as yesterday. And the Haftarah is in Yirmiyah (Jeremiah) "Thus Spoke Hashem: (the Nation) found favor in the desert" (Jeremiah 31:2) until "The son, precious to me, is Efrayim" (Jeremiah 31:20). On Motzaei Rosh HaShana, we make Havdala like on Motzaei Shabbos; however, we do not make a blessing on the spices or on the flame.
ב אַף בְּאֶרֶץ יִשְׂרָאֵל עוֹשִׂים רֹאשׁ הַשָּׁנָה שְׁנֵי יָמִים.
2 Even in the Land of Israel, we make Rosh HaShana two days.