Papers of John Guy Porter

An annotated, incomplete copy of Porter's script for 'The Night Sky in December' on the seventh comet of the year, Dr Roemer's second recovery of a comet this year, the Flagstaff Observatory, and a review of the 1957 comets (Encke, Mrkos, Reinmuth and Harrington), as well as Arend-Roland (a comet dated 1956); Venus very conspicuous in the south-west at sunset and visible at midday for an observer who knows where to look; the brilliance of this planet, its phases and its elongations; its clouds, with the cloud belts shown by ultraviolet photographs being not dissimilar to Jupiter's; and the axial tilt of Venus, the day length on the planet, the 8-year cycle of repetitions of its phenomena and the energy incident on Venus and the Earth from the Sun.

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