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Agricultural astrology is one of the oldest forms of astrology. It was probably one of the first use humans made of lunar cycles. [2]: 16 Evidence of its practice dates back thousands of years to the ancient peoples of the Nile and Euphrates River valleys.
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [ 1 ] [ 2 ] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980 .
Alchemical symbols were used to denote chemical elements and compounds, as well as alchemical apparatus and processes, until the 18th century. Although notation was partly standardized, style and symbol varied between alchemists.
The Medieval Year: Zodiac Signs and the Labors of the Months; A comprehensive collection of images at „flickr“ Digitized copy of LJS 499, Medical and astronomical miscellany, 15th Century Germany, from the Philadelphia, University of Pennsylvania, Rare Book & Manuscript Library: Contains zodiac signs and labors of the month.
Obsidian projectile point.. Obsidian is a naturally formed volcanic glass that was an important part of the material culture of Pre-Columbian Mesoamerica.Obsidian was a highly integrated part of daily and ritual life, and its widespread and varied use may be a significant contributor to Mesoamerica's lack of metallurgy.
Despite being sharper, prismatic obsidian is also considerably more brittle than steel; obsidian blades of the type used on the macuahuitl tended to shatter on impact with other obsidian blades, steel swords or plate armour. Obsidian blades also have difficulty penetrating European mail. The thin, replaceable blades used on the macuahuitl were ...
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Obsidius, [ii] a Roman traveler in Aethiopia, discovered a type of volcanic glass, which subsequently became a popular ornamental stone at Rome, known as lapis obsidianus, or obsidian. [ 6 ] [ 1 ] Gaius Opsidius Geminus, one of two brothers buried at Arusnates in the province of Venetia et Histria , sons of Valeria Maxima.