Papers of John Guy Porter

A copy of Porter's script for 'The Night Sky in October' on cycles in nature and astronomy; Jupiter in Gemini below Castor and Pollux, its retrograde motion and opposition, and the three-fold conjunction with Uranus; finding Uranus in the night sky, the achievement of William Herschel, and the close conjunction of Jupiter and Uranus on 10 May 1955; Mercury, Venus and Saturn not visible, and the rising and setting of Mars at the time of a summer opposition; ancient astronomy and epicycles, the system of Aristotle, Copernicus, the discoveries of Galileo and the theories of Kepler; the exhibition of historic astronomical books at the Science Museum, Kensington, and the works of Newton, Aristotle, Tycho Brahe, Kepler, Galileo, Hevelius, Flamsteed, Halley, Herschel, Bessel and Struve; and the books of Peter Apian and Voltaire, Huygens's clock and Meyer's star atlas.

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