Agnes Mary Clerke and Ellen Mary Clerke: An Appreciation is a detailed biographical and critical tribute to two remarkable Irish sisters, Agnes Mary Clerke and Ellen Mary Clerke, who made significant contributions to the fields of astronomy, literature, and science writing in the late nineteenth and early twentieth centuries. The book explores the lives, works, and intellectual achievements of Agnes, renowned for her authoritative histories of astronomy and her influential role in popularizing science, and Ellen, a talented writer, poet, and translator. Through personal recollections, correspondence, and analysis of their published works, the author paints a vivid portrait of the sisters’ upbringing in Skibbereen, County Cork, their education, and their lifelong dedication to scholarship and intellectual inquiry. The narrative highlights Agnes’s groundbreaking publications, such as A Popular History of Astronomy during the Nineteenth Century, her contributions to the Encyclopaedia Britannica, and her recognition by the Royal Astronomical Society. Ellen’s literary output, including her poetry, essays, and translations from Italian, is also examined, revealing her unique voice and cultural insights. The book situates the Clerke sisters within the broader context of Victorian intellectual life, emphasizing their perseverance in a male-dominated academic world and their enduring legacy as pioneers for women in science and literature. Rich in historical detail and personal anecdotes, Agnes Mary Clerke and Ellen Mary Clerke: An Appreciation offers an inspiring account of two extraordinary women whose curiosity, intellect, and passion for knowledge left an indelible mark on their era.