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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 янв 1912 г. - Publishes a table of 25 different Cepheid variable periods.
Добавлено на ленту времени:
Henrietta Leavitt
By
Shawn Cunning
2 окт 2018
0
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499
Дата:
1 янв 1912 г.
Сейчас
~ 113 г назад
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