Saints of the Week: Nicolaus Copernicus and Johannes Kepler
5/21/2026
Nicolaus Copernicus, 1543,
and Johannes Kepler, 1630
Astronomers
From A Great Cloud of Witnesses:
Born in 1473, Nicolaus Copernicus first studied law and medicine before serving as a cleric under the direction of his uncle, the Bishop of Warmia (in northeastern Poland). Copernicus first set forth his heliocentric theory of astronomy in a small work called the Commentariolus, which was not published until 1878. His argument that the sun, rather than the earth, was the center of the universe around which the planets rotated was developed fully in his 1543 opus De Revolutionibus Orbium Caelestium.
The initial ecclesiastical reaction to his revolutionary theory was somewhat muted, but when his thought was further developed by Galileo, the religious debate was intensified, and De revolutionibus was placed on the index of banned books. Copernicus had originally dedicated his work to the Pope, and he saw no conflict between his theory and the authority of Scripture.
Among those chiefly responsible for the solidifying of Copernicus’ theories was the German astronomer Johannes Kepler. Born nearly a century after Copernicus, Kepler was first educated at Tübingen, where he received instruction in Copernican theory. His first major work on Copernican astronomy was the Mysterium Cosmographicum, in which he believed he had demonstrated God’s geometric plan for the universe. Kepler saw in the relation between the sun and the rotating planets the image of God himself, and like Copernicus, he saw no conflict between his astronomical views and the account of God in the Scriptures. Kepler is chiefly known for his discovery of the laws of planetary motion, set forth variously in his later works.
Though their works were each controversial in their own way, Copernicus and Kepler laid the groundwork for modern astronomy. Kepler’s work was even influential on Isaac Newton’s theory of universal gravitation.
Both men, through their life’s work, testified to the extraordinary presence of God in creation and maintained, in the face of both religious and scientific controversy, that science can lead us more deeply into an understanding of the workings of the Creator.
As the heavens declare your glory, O God, and the firmament shows your handiwork, we bless your Name for the gifts of knowledge and insight you bestowed upon Nicolaus Copernicus and Johannes Kepler; and we pray that you would continue to advance our understanding of your cosmos, for our good and for your glory; through Jesus Christ, the firstborn of all creation, who with you and the Holy Spirit lives and reigns, one God, for ever and ever. Amen.
