Template:Selected anniversaries/February 19
1473: Mathematician and astronomer Nicolaus Copernicus born. He will formulate a model of the universe that places the Sun rather than the Earth at the center of the universe.
1616: The Inquisition asked a commission of theologians, known as qualifiers, about the propositions of the heliocentric view of the universe after Nicollo Lorin had accused Galileo Galilei of heretical remarks in a letter to his former student, Benedetto Castelli.
1919: Mathematician and academic Alexander Andreevich Samarskii born. Samarskii will contribute to applied mathematics, numerical analysis, mathematical modeling, and finite difference methods.
1946: Mathematician and academic Alan Turing presents the "Proposal for the Development in the Mathematics Division of an Automatic Computing Engine (ACE) to a meeting of the Executive Committee of the National Physical Laboratory (NPL); the proposal will be approved at a second meeting held a month later.