Jacobus Golius
Encyclopedia
Jacob Golius was a Dutch
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 Orientalist
Oriental studies
Oriental studies is the academic field of study that embraces Near Eastern and Far Eastern societies and cultures, languages, peoples, history and archaeology; in recent years the subject has often been turned into the newer terms of Asian studies and Middle Eastern studies...

 and mathematician
Mathematician
A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....

.

Golius came to the University of Leiden in 1612 to study mathematics. In 1618 he registered again to study Arabic
Arabic language
Arabic is a name applied to the descendants of the Classical Arabic language of the 6th century AD, used most prominently in the Quran, the Islamic Holy Book...

 and other Eastern languages, where he was the most distinguished pupil of Erpenius. In 1622 he accompanied the Dutch embassy to Morocco
Morocco
Morocco , officially the Kingdom of Morocco , is a country located in North Africa. It has a population of more than 32 million and an area of 710,850 km², and also primarily administers the disputed region of the Western Sahara...

, and on his return he was chosen to succeed Erpenius (May 12, 1625). In the following year he set out on a Syrian and Arabian tour from which he did not return until 1629. The remainder of his life was spent at Leiden where he held the chair of mathematics
Mathematics
Mathematics is the study of quantity, space, structure, and change. Mathematicians seek out patterns and formulate new conjectures. Mathematicians resolve the truth or falsity of conjectures by mathematical proofs, which are arguments sufficient to convince other mathematicians of their validity...

 as well as that of Arabic.

His most important work is the Lexicon Arabico-Latinum, (Leiden, 1653), which, based on the Sihah of Al-Jauhari
Ismail ibn Hammad al-Jawhari
Abu Nasr Isma'il ibn Hammad al-Jawhari or al-Jauhari was the author of a notable Arabic dictionary. He was born in the city of Farab a.k.a. Otrar in Turkestan . He studied Arabic language first in Baghdad and then among the Arabs of the Hejaz. Then he settled in northern Khorasan...

, was only superseded by the corresponding work of Freytag
Georg Wilhelm Friedrich Freytag
Georg Wilhelm Friedrich Freytag was a German philologist.Freytag was born in Lüneburg. After attending school he entered the University of Göttingen as a student of philology and theology; here from 1811 to 1813 he acted as a theological tutor, but in the latter year accepted an appointment as...

 in 1837. Among his earlier publications may be mentioned editions of various Arabic texts (Proverbia quaedam Alis, imperatoris Muslemici, et Carmen Tograipoetae doctissimi, necnon dissertatio quaedam Aben Synae, 1629; and Ahmedis Arabsiadae vitae et rerum gestarum Timuri, gui vulgo Tamer, lanes dicitur, historia, 1636). In 1656 he published a new edition, with considerable additions, of the Grammatica Arabica of Erpenius. After his death, there was found among his papers a Dictionarium Persico-Latinum which was published, with additions, by Edmund Castell
Edmund Castell
Edmund Castell was an English orientalist.He was born at Tadlow, in Cambridgeshire. At the age of fifteen he entered Emmanuel College, Cambridge, gaining his BA in 1624-5 and his MA in 1628. Appointed Professor of Arabic in 1666, with the full title 'Sir Thomas Adams Professor of Arabic'. He...

 in his Lexicon heptaglotton (1669). Golius also edited, translated and annotated the astronomical treatise of Alfragan (Muhammedis, filii Ketiri Ferganensis, qui vulgo Alfraganus dicitur, elementa astronomica Arabice et Latine, 1669).

Golius taught mathematics to the French philosopher René Descartes
René Descartes
René Descartes ; was a French philosopher and writer who spent most of his adult life in the Dutch Republic. He has been dubbed the 'Father of Modern Philosophy', and much subsequent Western philosophy is a response to his writings, which are studied closely to this day...

, and later corresponded with him.
It is therefore highly probable that he was able to read to him parts of the mathematical Arabic texts he had started to collect, among others on the Conics.

Jacobus Golius played a role in convincing Europeans about the Jesuit
Jesuit China missions
The history of the missions of the Jesuits in China is part of the history of relations between China and the Western world. The missionary efforts and other work of the Society of Jesus, or Jesuits, between the 16th and 17th century played a significant role in continuing the transmission of...

s' discovery that the mysterious Cathay
Cathay
Cathay is the Anglicized version of "Catai" and an alternative name for China in English. It originates from the word Khitan, the name of a nomadic people who founded the Liao Dynasty which ruled much of Northern China from 907 to 1125, and who had a state of their own centered around today's...

, visited by Marco Polo
Marco Polo
Marco Polo was a Venetian merchant traveler from the Venetian Republic whose travels are recorded in Il Milione, a book which did much to introduce Europeans to Central Asia and China. He learned about trading whilst his father and uncle, Niccolò and Maffeo, travelled through Asia and apparently...

 and other travelers in the 13th century was the same country as China, reached by the Portuguese sailors in the early 16th century. Although Golius knew no Chinese, he was familiar with Zij-i Ilkhani
Zij-i Ilkhani
Zīj-i Īlkhānī or Ilkhanic Tables is a Zij book with astronomical tables of planetary movements. It was compiled by the Persian astronomer Nasir al-Din al-Tusi in collaboration with his research team of astronomers at the Maragha observatory...

, a work by the Persian astronomer Nasir al-Din al-Tusi
Nasir al-Din al-Tusi
Khawaja Muḥammad ibn Muḥammad ibn Ḥasan Ṭūsī , better known as Naṣīr al-Dīn al-Ṭūsī , was a Persian polymath and prolific writer: an astronomer, biologist, chemist, mathematician, philosopher, physician, physicist, scientist, theologian and Marja Taqleed...

, completed in 1272, in which he had described the "Cathayan" Calendar
Chinese calendar
The Chinese calendar is a lunisolar calendar, incorporating elements of a lunar calendar with those of a solar calendar. It is not exclusive to China, but followed by many other Asian cultures as well...

. When the China-based Jesuit Martino Martini
Martino Martini
Martino Martini was an Italian Jesuit missionary, cartographer and historian, mainly working on ancient Imperial China.-Early years:Martini was born in Trento, in the Bishopric of Trent...

 visited Leyden in 1654, the curious Golius arranged to meet him. As Golius started reciting the names of the 12 divisions
Earthly Branches
The Earthly Branches provide one Chinese system for reckoning time.This system was built from observations of the orbit of Jupiter. Chinese astronomers divided the celestial circle into 12 sections to follow the orbit of Suìxīng . Astronomers rounded the orbit of Suixing to 12 years...

 into which, according to Nasir al-Din, the "Cathayans" were dividing the day, Martini, who of course knew no Persian, was able to continue the list. The names of the 24 solar term
Solar term
A solar term is any of 24 points in traditional East Asian lunisolar calendars that matches a particular astronomical event or signifies some natural phenomenon. The points are spaced 15° apart along the ecliptic and are used by lunisolar calendars to stay synchronized with the seasons. Solar terms...

s matched reported by Nasir al-Din matched those that Martini had learned in China as well. The story, soon published by Martini in the "Additamentum" to his Atlas of China (Novus Atlas Sinensis), seemed to have finally convinced most Europeans scholars that China and Cathay were the same.
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