Rosh HaShanah is the Jewish New Year, a time of prayer, self-reflection, and repentance.
Moses went and spoke these things to all Israel. He said to them: "I am now one hundred and twenty years old, I can no longer be active. Moreover, the Eternal has said to me, 'You shall not go across yonder Jordan.'" - Deuteronomy 31:1-2
Yom Kippur means "Day of Atonement" and refers to the annual Jewish observance of fasting, prayer, and repentance.
Give ear, O heavens, let me speak; Let the earth hear the words I utter! - Deuteronomy 32:1