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Adds clock to telescope, enhancing distance measuring power. Search for Halley's Comet begins. Reports double star data; observes nebulae in JH's Catalogue of Nebulae. R.A.S. location moved to Somerset House. Quarrel between James South and Richard Sheepshanks being arbitrated.
Describes factors that led to C. P. Smyth's appointment to Cape. Uses rock crystal prism for double star observations. Continues observing JH's nebulae with equatorial clock. Approves of proposal for worldwide meteorological observations; will distribute brochures.
Details sighting of Halley's Comet; sends chart of dates, times, right ascension, and declination. Receives letter from Niccolo Cacciatore, which 'gives hopes of a new planet.'