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wood prints planet wood prints book wood prints ring wood prints 1600s wood prints galileo galilei wood prints historical wood prints italian wood prints no-one wood prints nobody wood prints writing wood prints phases wood prints phase wood prints saturnian wood prints venusian wood prints martian wood prints

photographs planet photos book photos ring photos 1600s photos galileo galilei photos historical photos italian photos no-one photos nobody photos writing photos phases photos phase photos saturnian photos venusian photos martian photos

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Galileo's planetary observations from 'Il Saggiatore' (1623, 'The Assayer'). This work by Italian astronomer Galileo Galilei (1564-1642), was about comets and contained treatises on natural philosophy and mathematics. The illustration on this page shows Saturn (centre left) and its rings. At centre right are Jupiter and Mars. Across bottom are observed phases of Venus. Galileo's observations with his telescope challenged the existing worldview that said the heavens were perfect and unchanging.

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