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Usage of the term "Greek fire" has been general in English and most other languages since the Crusades. Original Byzantine sources called the substance a variety of names, such as "sea fire" (Medieval Greek: πῦρ θαλάσσιον pŷr thalássion), "Roman fire" (πῦρ ῥωμαϊκόν pŷr rhōmaïkón), "war fire" (πολεμικὸν πῦρ polemikòn pŷr), "liquid fire ...
He is credited with the invention of Greek fire, the premodern precedent of the flamethrower. According to Constantine Porphyrogenitus, he arrived in Byzantium in the time of Constantine IV and shared his knowledge of liquid fire with the Byzantines. [9] [10] Callinicus’ exact formula was a carefully guarded secret, and remains unknown today ...
The Liber Ignium ad Comburendos Hostes (translated as On the Use of Fire to Conflagrate the Enemy, or Book of Fires for the Burning of Enemies, and abbreviated as Book of Fires) is a medieval collection of recipes for incendiary weapons, including Greek fire and gunpowder, written in Latin and allegedly written by a certain Marcus Graecus ("Mark the Greek")—a person whose existence is ...
Fire and the other Greek classical elements were incorporated into the Golden Dawn system. Philosophus (4=7) is the elemental grade attributed to fire; this grade is also attributed to the Qabalistic Sephirah Netzach and the planet Venus. [12] The elemental weapon of fire is the Wand. [13] Each of the elements has several associated spiritual ...
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
Often, it refers specifically to the value of the extent of reaction when equilibrium has been reached. It is usually denoted by the Greek letter ξ. The extent of reaction is usually defined so that it has units of amount . It was introduced by the Belgian scientist Théophile de Donder. [citation needed]
The Greek Fire Brigade has been battling more than 500 fires for almost two weeks, but the service said the risk of fire remained “extreme” for several areas of Greece on Thursday. Here we ...
Aristarchus's 3rd century BCE calculations on the relative sizes of, from left, the Sun, Earth and Moon, from a 10th-century CE Greek copy. On the Sizes and Distances (of the Sun and Moon) (Ancient Greek: Περὶ μεγεθῶν καὶ ἀποστημάτων [ἡλίου καὶ σελήνης], romanized: Perì megethôn kaì apostēmátōn [hēlíou kaì selḗnēs]) is widely accepted ...