On this day 482 years ago–June 25, 1530–the Reformation princes and free cities confessed their faith before Emperor Charles V at the Diet (the governing assembly of the Imperial states) held in Augsburg, Germany. The 28 articles drawn up by Philipp Melanchthon (not Luther!) became known as the Augsburg Confession. It was the first confession of faith of the Reformation and, to this day, it is perhaps the most succinct and definitive summaries of Lutheran theology.
Honor the day by reading it: Augsburg Confession – Book of Concord.