Alexander von Humboldt, Cosmos: A Sketch of the Physical Description of the Universe (1845)
William Whewell, The Elements Of Morality, Including Polity (1845)
Domingo Faustino Sarmiento, Facundo (1845)
Søren Kierkegaard, Stages on Life's Way (1845)
Georg Cantor (March 3)
August Wilhelm Schlegel (May 12)
Sydney Smith (February 22)
1845 in philosophy Wikipedia (Text) CC BY-SA