What did Xu Guangqi understand, Xu Guangqi, a well known scientist in the Ming Dynasty in China, wha

In terms of calendars, it is mainly concentrated in the compilation of the "Chongzhen Almanac Book" and the various sparse arrangements written for the reform of the calendar. In mathematics, he and Matteo Ricci translated the Geometric Originals. In terms of agriculture, there are "The Complete Book of Agricultural Administration", "Sweet Potato Shu", "Agricultural Relics and Miscellaneous Books", "Draft Agricultural Book", "Taixi Water Law" and so on.

In the military aspect, improve firearms.

He provided the theory of the number of pins, had a lot of mathematical knowledge, made a lot of contributions, and left relevant books.

The Encyclopedia of Agriculture, an agricultural encyclopedia, is of high scientific value, and the Chongzhen Almanac introduces some European astronomical knowledge, introducing the concepts of planets, circular earths, longitude and latitude. In the field of mathematics, the translation of the Geometry Primitives is missing. In the field of military pretense, he put forward the idea of "seeking the truth for backup", focusing on the manufacture of the best, and was the first person to introduce artillery manufacturing technology into the military field.

Xu Guangqi's books on fighting and grinding include "The Complete Book of Agricultural Administration", "Measuring the Heavens and Sayings", "The Great Measurement of the Base Struggle", "The Finger of the Calendar of the Day", "The Whole Meaning of Measurement", "The Table of the Winding of the Day", "The Original of Geometry", "The Pythagorean Meaning", "The Similarities and Differences of Measurement", "The Sweet Potato Shu", "The Miscellaneous Relics of the Agricultural Relics", "The Draft of the Agricultural Book", "The Water Law of Taixi", "The Recipe of the Selected Practice of the Hundred Characters", "The Selection of the Practicing Rules", and the "Practicing the Art of the Grid" of Yinzhi.

Xu Guangqi's achievements in the astronomical calendar are mainly concentrated in the compilation of the Chongzhen Almanac and the various sparse works written for the reform of the calendar. In the almanac, he introduced the concept of a circular earth and introduced the concepts of latitude and longitude.

Based on the Tycho Catalog and the traditional Chinese catalog, he provided the first all-celestial star chart, which became the basis for the Qing Dynasty star catalog. In terms of calculation methods, the accurate formulas of spherical and plane trigonometry were introduced, and the parallax, muffled and time differences were first corrected.

The main contents of the "Complete Book of Agricultural Administration".

The Complete Book of Agricultural Administration is an agricultural book created by Xu Guangqi in the Ming Dynasty, which was written in the Wanli period of the Ming Dynasty, basically covering all aspects of agricultural production and people's life in the Ming Dynasty of China, and there is a basic idea running through it, that is, Xu Guangqi's agricultural policy thought of governing the country and governing the people.

The Complete Book of Agricultural Administration is one of the five major agricultural books in ancient China, which is the culmination of agricultural science of the predecessors and summarizes the agricultural science and technology before the Qing Dynasty.

He is the author of "Xu's Words", "Six Posts of the Book of Poetry", "Pythagorean Righteousness", etc., and edited "The Complete Book of Agricultural Administration", "Chongzhen Almanac", and translated "Geometric Originals" Xu Guangqi met Matteo Ricci and expressed his admiration for him, hoping to learn Western natural science from him. Matteo Ricci saw that he was a man of letters, and wanted to learn from him the cultural classics of ancient China, and was keen to develop him as a Catholic, so he talked to him. They talked about astronomy and geography, and then they talked about Chinese and Western mathematics.

At parting, Matteo Ricci did not comment on Xu Guangqi's request to study Western natural science, but gave him two pamphlets promoting Catholicism. One is the Gospel of Margue, which tells the story of Jesus, and the other is The True Righteousness of God, which is a book written by Matteo Ricci in Chinese explaining Catholic teachings. (1603) the thirty-first year of Wanli.

After three years of consideration, Xu Guangqi was baptized in Nanjing, and the family joined the Catholic Church. Since then, Xu Guangqi has been the most effective cadre in the church. Ben", "Tessie Water Law", etc.

"Geometric Original", "The Complete Book of Agricultural Administration", "Chongzhen Almanac" and "Examination Notes".

He didn't invent anything, but he had a great achievement. But he made important contributions to mathematics, astronomy, calendar, military affairs, surveying, agriculture, and water conservancy.