וְהָיָ֣ה ׀ בַּיּ֣וֹם הַה֗וּא נְאֻם֙ אֲדֹנָ֣י יְהוִ֔ה וְהֵבֵאתִ֥י הַשֶּׁ֖מֶשׁ בַּֽצָּהֳרָ֑יִם וְהַחֲשַׁכְתִּ֥י לָאָ֖רֶץ בְּי֥וֹם אֽוֹר׃
And it shall come to pass in that day, Saith the Lord GOD, That I will cause the sun to go down at noon, And I will darken the earth in the clear day.
Read halakhic rulings (Jewish law) on Amos 8:9: and classical halakhic sources.