Historical Meaning
Tradition teaches that Rosh Hashanah is the anniversary of the first day of creation. Challah, the loaf of braided bread traditionally eaten on Shabbat, is made into a circle to symbolize the continuity of creation. Job 38:7 mentions that during creation “all the sons of God shouted for joy (Complete Jewish Bible).” G-d declared his creation good, and so can we as we shout with the final shofar blast!
Leviticus 23:24 calls Rosh Hashanah a memorial or a day for remembering. Days that are memorials are also often a time for renewing commitments. What commitment comes with creation? The creation story implies a pure relationship with G-d as Adam and Eve had with him before sin entered the world. Rosh Hashanah is a great time to recommit yourself toward seeking pure relationships with G-d and other people, and if necessary, making amends with those whom you may have offended or who have offended you.
More about Rosh Hashanah