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St. Dominic, well known as the patron saint of astronomers and astronomy, as well as falsely accused persons, is a popular saint. He is also the founder of the Order of Preachers, more commonly known as the Dominicans.Because of his close association with astronomy, many St. Dominic Medals include a star. His mother reported seeing a star shining from his chest on the day of his baptism, and this may be part of the reason he became the patron saint of astronomers and scientists. In many patron saint charms he is pictured over a book, for he was always a man of learning.
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The Dominican Order chose the colors of black and white to represent the balance between penance and purity, but those colors also represent the black night sky with the white sparks of stars. The stars and the study of astronomy also remind us of the holy star that lit the way in Bethlehem for the three wise men who discovered the birth of Jesus. Much of the St. Dominic jewelry available includes the colors black and white for those reasons.