This was very accurate and precise and, in places where there were exceptions, allowed for him to predict where new elements would be placed and their relative atomic mass, to a great degree of accuracy (1 янв 1869 г. – 23 ч 59 мин, 31 дек 1869 г.)
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1 янв 1869 г.
23 ч 59 мин, 31 дек 1869 г.
~ 12 months