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Two astronomers observe the firmament in a woodcut circa 1545 by Heinrich Vogtherr the Elder.

Photo: akg-images

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Frontispice and title page of the third London edition of Sir Isaac Newton's "Philosophia naturalis principia mathematica", 1687.

Photo: akg-images / British Library

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Charles Darwin, circa 1870.

Photo: akg-images

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The northern firmament, from Christoph Cellarius' "Harmonia Macrocosmica", 1660.

Photo: akg-images

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A manuscript page from Leonardo da Vinci's "Sul volo degli uccelli" (On the Flight of Birds), with a mechanical reconstruction of a bird's wing, now in the Biblioteca Reale, Turin.

Photo: akg-images / Electa