Papers of John Guy Porter

A copy of Porter's script for 'The Night Sky in February' on Leo, Virgo, Regulus and Spica; the north pole of the Milky Way; Saturn; the full moon at apogee, the motion of the orbit of the Moon, and Hipparchus and his discovery of the Moon's motion; the Earth and the Moon considered as a double planet system, with the effects of this on the Earth; Professor Brown's tables of the Moon, their use, and the gradual increase in residuals and the reasons for this; and the craters of the Moon and their causes.