Papers of John Guy Porter

An annotated copy of Porter's script for 'The Night Sky in December' on the year in retrospect; Venus, a morning star; Jupiter near Castor and Pollux; the constellations of Perseus, the mythology of the Milky Way, the aspect of the stars near Mirfak and star clusters in Perseus; Algol and the Pleiades, Arabic star names, and the variability of Algol discovered by Goodricke; Goodricke's achievements, the explanation of eclipsing binaries and the timing of Algol's maxima; the light-time across the Earth's orbit, Roemer's work at Paris, the four moons of Jupiter and Roemer's achievements; and books on astronomy for Christmas.

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