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Relationship with William

Throughout her writings, she repeatedly made it clear that she desired to earn an independent wage and be able to support herself. When the crown began paying her for her assistance to her brother in 1787, she became the first woman—at a time when even men rarely received wages for scientific enterprises—to receive a salary for services to science. Her pension was £50 a year, and it was the first money that Caroline had ever earned in her own right.

When William married a rich widow, Mary Pitt (née Baldwin) in 1788, the union caused tension in the brother-sister relationship. Caroline has been referred to as a bitter, jealous woman who worshipped her brother and resented those who invaded their domestic lives.

In his book The Age of Wonder, Richard Holmes is more sympathetic to Caroline's position, noting that the change was in many respects negative for Caroline. With the arrival of William's wife, Caroline lost her managerial and social responsibilities in the household and accompanying status. She also moved from the house to external lodgings, returning daily to work with her brother. She no longer held the keys to the observatory and workroom, where she had done much of her own work. As she destroyed her journals from 1788 to 1798, her feelings about the period are not entirely known. In August 1799, Caroline was independently recognized for her work, when she spent a week in Greenwich as a guest of the royal family.

Barthélemy Faujas de Saint-Fond indicated she and her brother continued working well during this period. When her brother and his family were away from home, she often returned there to take care of it for them. In later life, she and Lady Herschel exchanged affectionate letters, and she became deeply attached to her nephew, astronomer John Herschel.

William's marriage likely led to Caroline becoming more independent of her brother and more a figure in her own right. Caroline made many discoveries independently of William and continued to work solo on many of the astronomical projects which contributed to her rise to fame.