In the transformative era of the mid-nineteenth century, 'The Glass Universe' chronicles the remarkable journey of female calculators at the Harvard College Observatory. These pioneers, initially comprising relatives of astronomers and later including graduates from prominent women's colleges, shifted from manual data analysis to groundbreaking explorations of the heavens through the lens of glass photographic plates. Funded by a widow dedicated to stellar photography, over half a million plates enabled these women to make significant astronomical discoveries. Unveiling what stars are composed of, categorizing them for scientific progress, and measuring astral distances, their efforts earned global recognition. Figures like Williamina Fleming, Annie Jump Cannon, and Dr. Cecilia Helena Payne emerged from obscurity, advancing astronomy and shattering the glass ceiling. Their stories, woven from personal letters and diaries, illuminate the irreplaceable role women played in unearthing our cosmic context, as presented by Dava Sobel in this exquisite narrative.