The stargazer's sister / Carrie Brown.

Enhanced descriptions from Syndetics:

From the acclaimed author of The Last First Day, here is a beautiful new period novel: a nineteenth-century story of female empowerment before its time, based on the life of Caroline Herschel, sister of the great composer and astronomer William Herschel and an astronomer in her own right.

This exquisitely imagined novel opens as William rescues Caroline from a life of drudgery in Germany and brings her to England and a world of music making and stargazing. Lina, as Caroline is known, serves as William's assistant and the captain of his exhilaratingly busy household. William is generous, wise, and charismatic, an obsessive genius whom Lina adores and serves with the fervency of a beloved wife. When William suddenly announces that he will be married, Lina watches her world collapse. With her characteristically elegant prose, Carrie Brown creates from history a compelling story that interweaves familial collaboration and conflict with a haunting exploration of the sublime beauty of astronomy and our small but essential place within a vast and astonishing cosmos. Through Lina's trials and successes we witness the dawning of an early feminist consciousness--a woman struggling to find her own place among the stars.