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Hevelius's book on comets. Title page of Cometographia (1668), by the Polish astronomer Johannes Hevelius. The artwork shows three astronomers representing three theories about comets. From left, the theories are: Aristotle's sublunar theory (that comets orbit between the Moon and the Earth); Hevelius's theory that comets originate from Jupiter or Saturn and follow parabolic paths around the Sun; and Kepler's theory that comets move in a straight line. On the roof of the building (right), telescopes and sextants are being used to observe a comet (top left).
Hevelius's book on comets. Title page of Cometographia (1668), by the Polish astronomer Johannes Hevelius. The artwork shows three astronomers representing three theories about comets. From left, the theories are: Aristotle's sublunar theory (that comets orbit between the Moon and the Earth); Hevelius's theory that comets originate from Jupiter or Saturn and follow parabolic paths around the Sun; and Kepler's theory that comets move in a straight line. On the roof of the building (right), telescopes and sextants are being used to observe a comet (top left).
Herschel's galactic model, 1784. This is one of several visualizations drawn by the British astronomer William Herschel (1738-1822). Working with his sister, Caroline, Herschel plotted the position of many of the Milky Way's stars, and used this data to construct models of the Milky Way galaxy, as seen from the outside. The crosses represent stars, while the letters refer to specific stars and constellations. The model is not particularly accurate, but does show the central band of stars that is the central plane of our galaxy. A version of this model was published in Account of Some Observations Tending to Investigate the Construction of the Heavens (Philosophical Transactions of the Royal Society of London, volume 74, 1784).
Herschel's galactic model, 1784. This is one of several visualizations drawn by the British astronomer William Herschel (1738-1822). Working with his sister, Caroline, Herschel plotted the position of many of the Milky Way's stars, and used this data to construct models of the Milky Way galaxy, as seen from the outside. The crosses represent stars, while the letters refer to specific stars and constellations. The model is not particularly accurate, but does show the central band of stars that is the central plane of our galaxy. A version of this model was published in Account of Some Observations Tending to Investigate the Construction of the Heavens (Philosophical Transactions of the Royal Society of London, volume 74, 1784).
Herschel's galactic model, 1784. This is one of several visualizations drawn by the British astronomer William Herschel (1738-1822). Working with his sister, Caroline, Herschel plotted the position of many of the Milky Way's stars, and used this data to construct models of the Milky Way galaxy, as seen from the outside. The crosses represent stars, while the letters refer to specific stars and constellations. The model is not particularly accurate, but does show the central band of stars that is the central plane of our galaxy. A version of this model was published in Account of Some Observations Tending to Investigate the Construction of the Heavens (Philosophical Transactions of the Royal Society of London, volume 74, 1784).
Herschel's galactic model, 1784. This is one of several visualizations drawn by the British astronomer William Herschel (1738-1822). Working with his sister, Caroline, Herschel plotted the position of many of the Milky Way's stars, and used this data to construct models of the Milky Way galaxy, as seen from the outside. The crosses represent stars, while the letters refer to specific stars and constellations. The model is not particularly accurate, but does show the central band of stars that is the central plane of our galaxy. A version of this model was published in Account of Some Observations Tending to Investigate the Construction of the Heavens (Philosophical Transactions of the Royal Society of London, volume 74, 1784).