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2 giorni fa · Around 150 AD, Greek-Roman scientist Ptolemy, in his Almagest, gave a value for π of 3.1416, which he may have obtained from Archimedes or from Apollonius of Perga. Mathematicians using polygonal algorithms reached 39 digits of π in 1630, a record only broken in 1699 when infinite series were used to reach 71 digits.
2 giorni fa · Piero de' Medici (1416–1469), Cosimo's son, was only in power for five years (1464–1469). He was called "Piero the Gouty" because of the gout that pained his foot and led to his death. Unlike his father, Piero had little interest in the arts.
- By Medico, Castellan of Potrone, considered the first ancestor of the house
- 1230; 793 years ago
2 giorni fa · 57 BC–935 AD: Gaya confederacy: 42–562: Northern and Southern period. United Silla (Unified Silla) 668–935: Balhae: 698–926: Later Three Kingdoms ...
2 giorni fa · Elenco delle più note presunte apparizioni mariane. Segue l'elenco di alcune delle più note apparizioni mariane, con l'indicazione della data e del luogo in cui sarebbero avvenute e delle persone che le avrebbero avute. Solo alcune sono state riconosciute, dalla Chiesa cattolica o da altre Chiese.
1 giorno fa · The early Cyrillic alphabet was developed in the 9th century AD and replaced the earlier Glagolitic script developed by the theologians Cyril and Methodius. It is the basis of alphabets used in various languages, past and present, Slavic origin, and non-Slavic languages influenced by Russian. As of 2011, around 252 million people in Eurasia use ...
3 giorni fa · 25–871 AD Ce: Tribal kingdom 1st century–900 AD Dal Riada: Dunadd Kingdom 501–878 AD Fortriu: Tribal kingdom 1–850 AD Galloway: Kingdom c. 1000–1234 AD Gododdin: Kingdom 5th–8th centuries AD Mann and Isles: Kingdom 848–1266 AD Moray: Kingdom c. 970–1130 AD Pictland: Kingdom 452–850 Scotland: Stirling, Edinburgh Kingdom 843 ...
2 giorni fa · 1st century AD: The aeolipile, a simple steam turbine is recorded by Hero of Alexandria. [263] 1st century AD: The first use of respiratory protective equipment is documented by Pliny the Elder ( c. 23 AD –79) using animal bladder skins to protect workers in Roman mines from red lead oxide dust.
