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Keyword: Henreitta Leavitt
![Генриетта Левитт калибрует звезды](https://images.astronet.ru/pubd/2000/12/19/0001162445/leavitt_aavso_sml.preview.jpg)
3.09.2000
Humanity's understanding of the relative brightness and variability of stars was revolutionized by the work of Henrietta Swan Leavitt (1868-1921). Working at Harvard College Observatory, Leavitt precisely calibrated the photographic magnitudes of 47 stars to which all other stars could be compared.
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