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The Periodic Table
See the interactive periodic table. Although some elements, such as gold and iron, have been known to humans since prehistoric times, it wasn't until the 17th century that the first scientific…Brewer's: Canicular Period
A cycle of 1461 years or 1460 Julian years, called a “Sothic period.” When it was supposed that any given day had passed through all the seasons of the year. Source: Dictionary of Phrase…Table of Geological Periods
It is generally assumed that planets are formed by the accretion of gas and dust in a cosmic cloud, but there is no way of estimating the length of this process. Our Earth acquired its present size…Brewer's: Julian Period
is produced by multiplying together the lunar cycle, the solar cycle, and the Roman indiction. The first year of the Christian era corresponded to the year 4713 of the Julian, and…Brewer's: Callippic Period
The correction of the Metonic cycle by Callippos. In four cycles, or seventy-six years, the Metonic calculation was seven and a-half in excess. Callippos proposed to quadruple the period…Brewer's: Phoenix Period
or Cycle, generally supposed to be 500 years; Tacitus tells us it was 250 years; R. Stuart Poole that it was 1,460 Julian years, like the Sothic Cycle; and Lipsius that it was 1,500 years…Brewer's: Renaissance Period
(The). That period in French history which began with the Italian wars in the reign of Charles VIII. and closed with the reign of Henri II. It was the intercourse with Italy, brought about…Periodic Table Quiz I
Welcome, aspiring chemists, to the ultimate elemental challenge: the Periodic Table Quiz! Prepare to embark on an atomic adventure that takes you from the reactive world of alkali metals to the noble…Contributions to Periodicals 1831-32
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