Agnes Mary Clerke (1842–1907) first published A Popular History of Astronomy in 1885. The work was received with widespread acclaim and brought Clerke an international reputation as a science writer. The History surveys the progress made in the field of astronomy during the nineteenth century. It is split chronologically into two parts, dealing with the first and the second half of the century. Part 1 focuses on the career of the astronomer William Herschel (1738–1822) and the development of sidereal astronomy; part 2 deals with the discovery of spectrum analysis and the progress of knowledge about sun spots and the magnetic disturbances which cause them. Clerke's work, a classic example of Victorian popular scientific literature, stands alongside Grant's earlier History of Astronomy in its success in popularising the subject. The work is important today for scholars researching the history of the discipline and its place in educated Victorian society.
Agnes Mary Clerke was an astronomer. She was not a practical astronomer, but instead collated, interpreted, and summarized the results of astronomical research. In 1888 she spent three months at the Cape Observatory as the guest of the director, Sir David Gill, and his wife, and there became sufficiently familiar with spectroscopic work to be able to write about this newer branch of the science with increased clearness and confidence.
In 1892 she was awarded the Actonian Prize of 100 guineas by the Royal Institution. As a member of the British Astronomical Association she attended its meetings regularly, as well as those of the Royal Astronomical Society. In 1903, with Lady Huggins, she was elected an honorary member of the Royal Astronomical Society, a rank previously held only by two other women, Caroline Herschel and Mary Somerville.
Her sister, Ellen Mary Clerke (1840–1906), also wrote about astronomy.