During the 1880s, a Mr. H. Petit of Belmont, Ontario had a large telescope and corresponded with A.F. Miller and other members of the Astronomical and Physical Society of Toronto. He may or may not have contributed to the unsuccessful efforts of Mr. Charles Clark to start a corresponding society in London at that time. Mr. H. Pettit of Belmont was elected a corresponding member of the Astronomical and Physical Society of Toronto on 1890-06-17. His name was not included in the list of corresponding members in 1891.

Mr. John Goldie, of Galt, was elected a corresponding member of the Astronomical and Physical Society of Toronto on 1890-06-17. In 1891, his membership was recategorized to the "Life" category in consideration of his sponsorship of the Society's Library, and in 1892 his membership was recategorized as "Active".

During the American civil war, Andrew Elvins came in contact with Daniel K. Winder, who was an enthusiastic student of science. He had been a professor in an Ohio college (at or near Cleveland, likely Hygeia Female Athenaeum, part of a mid-century Utopian community near Cincinnati), but was a pacifist, being opposed to war under all circumstances, and also holding the view that the Bible tolerated slavery. Consequently, he found it very uncomfortable in Ohio and so came to Toronto, where he settled and obtained a living as a printer.

Andrew Frederick Hunter (December 31, 1863-October 19, 1940) joined the Astronomical Society in the 1880s while he was a student in Mathematics and Physics at the University of Toronto. He had grown up near Barrie, about 80 km north of Toronto, and returned there as owner and editor of the local newspaper, the Barrie Examiner, following graduation in 1889. He became a town Councillor in Barrie and was a talented amateur archaeologist and local historian. His History of the County of Simcoe is still a valuable reference work.

John Hume Kedzie (1815–1903) was an American lawyer, real-estate developer, and politician.

Lewis A. Swift (February 29, 1820 – January 5, 1913) was an American astronomer.

Henry Harrison self-published a book of the Moon in 1880, and financed some expensive lithographs of our natural satellite, with an 18-inch disc. He donated one of these to the Meaford Astronomical Society in 1898, and presented some copies to J.R. Collins for the benefit of the RASC in 1912. Harrison also painted a portrait in 1890 of Prof. C.H.F. Peters, recently deceased director of Litchfield Observatory, Hamilton College, Clinton NY. It seems that Harrison was familiar with the dynamic Prof.