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John Greaves (1602 – 8 October 1652) was an English mathematician, astronomer and antiquary. ==Life== He was born in Colemore, near Alresford, Hampshire. He was the eldest son of John Greaves, rector of Colemore, and Sarah Greaves.〔 Shalev, Zur (2005). (''The travel notebooks of John Greaves'' ) in Intersections: Yearbook for early modern studies Vol. 5, 2005. Leiden: Koninklijke Brill NV.〕 His brothers were Nicholas Greaves, Thomas Greaves and Sir Edward Greaves, physician to Charles II. His father ran a school for sons of the neighbouring gentry, where Greaves began his education.〔Macquorn Rankine, W. J. in (''Imperial Dictionary of Universal Biography'' ) Vol II, p.713 London: William Mackenzie〕 Aged 15, he went to Balliol College, Oxford between 1617–1621, gaining a B.A. degree. In 1624 he was the first of five newly elected Fellows of Merton College, becoming M.A. in 1628. He began to study astronomy and oriental languages, and especially the works of the ancient eastern astronomers. In 1630 Greaves was chosen professor of geometry at Gresham College, London. Through his predecessor, Peter Turner, he later met archbishop William Laud, the chancellor of Oxford University and Visitor (patron) of Merton College. Laud was keen to make English editions of Greek and Arabic authors, and Greaves' later travels abroad involved collecting manuscripts and books for presentation to his new patron. Greaves enrolled at University of Leyden in 1633, where he became friends with Jacob Golius, professor of Arabic at Leyden. He enrolled at the University of Padua in 1635 along with George Ent, meeting the Dane Johan Rode (John Rhodius), an expert on ancient weights and measures, who also made a commentary on Celsus. A brief return to England was followed by a second European journey; in 1636 he sailed via Livorno (Leghorn) to Rome, dining with Ent on 5 October at the English College, Rome; he also met William Harvey, who was entertained at the College on the 12th, Gasparo Berti, Lucas Holstenius and Athanasius Kircher. Probably in the same month he met and consulted with the Earl of Arundel's art-collecting agent, William Petty (who dined at the College on 14 October), on the Earl's attempted acquisition of the Obelisk of Domitian, then still lying broken in the Circus of Maxentius. Though 'now it is broken into 5 stones' he measured these and including a sketch of the obelisk as hypothetically repaired in his almanac-notebook (Bodleian Library Savile MS 49,1). Though Arundel paid a 60 crown deposit for the obelisk, pope Urban VIII vetoed its export and it was erected by his successor Innocent X above Bernini's ''Fountain of the Four Rivers'' in the Piazza Navona.〔Edward Chaney, "Roma Britannica and the Cultural Memory of Egypt: Lord Arundel and the Obelisk of Domitian", in ''Roma Britannica: Art Patronage and Cultural Exchange in Eighteenth-Century Rome'', eds. D. Marshall, K. Wolfe and S. Russell, British School at Rome, 2011, pp. 147–70, fig. 11.11.〕 Greaves toured the Catacombs and made drawings of the Pantheon and Pyramid of Cestius. During his stay in Rome he instituted inquiries into the ancient weights and measures that are among the early classics of metrology. In 1637 he made a journey to the Levant, one (unfulfilled) intention being to fix the latitude of Alexandria where Ptolemy had made his astronomical observations. He sailed from England to Livorno in the company of Edward Pococke; after a brief visit to Rome, he arrived in Istanbul (Constantinople) around April 1638. There he made the acquaintance of the English ambassador Sir Peter Wyche. He procured various manuscripts there, including a copy of Ptolemy's Almagest ("the fairest work I ever saw").〔Greaves, John (1647); ''A Discourse on the Roman Foot and Denarius'' London: Wm Lee. p.47〕 Greaves ended up owning two copies of the Almagest. He was going to have visited the many monastic libraries at Mount Athos, in order to make a catalogue of their MSS and unprinted books. Athos was normally open only to members of the Orthodox church, but thanks to a special dispensation from the Patriarch of Constantinople Cyril Lucaris, Greaves would have had access; but the execution of the patriarch by strangulation in June 1638 for treason against Sultan Murad IV prevented his journey.〔 Instead, Greaves continued on to Alexandria, where he collected a number of Arabic, Persian and Greek manuscripts. He was an inveterate note-taker, making countless observations in notebooks and on blank pages of other books he bought; he also visited Cairo twice, and made a more accurate survey of the pyramids of Egypt than any traveller who had preceded him. He returned to England in 1640. On the death of John Bainbridge in 1643, Greaves was appointed as Savilian professor of astronomy and senior reader of the Linacre lecture at Oxford; but he was deprived of his Gresham professorship for having neglected its duties. In 1645 he essayed a reformation of the calendar; but although his plan of omitting the bissextile day (29 February) for the next 40 years was approved by the king, the matter was dropped owing to the turbulent times. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「John Greaves」の詳細全文を読む スポンサード リンク
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