Correspondence regarding observations and calculations provided by the Royal Observatory, comprised of enquiries from other observatories, astronomers, the Admiralty and the general public and the Observatory's replies:

Observations and calculations, 1915-1916, concerning the position of Polaris, Greenwich parallaxes, the position of the Moon, flexure determinations, times of sunset and errors of the Moon.

Observations and calculations, 1917-1925, concerning the position of Polaris; the declination, position, bearing, azimuth, mean error of longitude, passage, elevation and ascension of the Moon; the position, areas of sunspots, equinoxes and lighting-up times of the Sun; inter-stellar distances, declination, etc., of stars; and the position, declination and ascension of planets.