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feb 14, 1911 - E. HERTZSPRUNG Y H.N. RUSSELL CLASIFICACION DE LAS ESTRELLAS
Added to timeline:
GRAN METRO DE LA CIENCIA HUGO SÁNCHEZ 1º BACH
By
Hugo sanchez moreno
21 Oct 2018
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341
Date:
feb 14, 1911
Now
~ 114 years ago
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