Question: What is a staple food in the place that had a lot of contacts during Yuan with the country of the person able to describe the process of evaporation?

Han-era astronomers adopted a geocentric model of the universe, theorizing that it was shaped like a sphere surrounding the earth in the center. Although others disagreed with his model, Wang Chong accurately described the water cycle of the evaporation of water into clouds. They assumed that the Sun, Moon, and planets were spherical and not disc-shaped. They also thought that the illumination of the Moon and planets was caused by sunlight, that lunar eclipses occurred when the Earth obstructed sunlight falling onto the Moon, and that a solar eclipse occurred when the Moon obstructed sunlight from reaching the Earth. <SEP> the yuan undertook extensive public works. among kublai khan's top engineers and scientists was the astronomer guo shoujing, who was tasked with many public works projects and helped the yuan reform the lunisolar calendar to provide an accuracy of 365.2425 days of the year, which was only 26 seconds off the modern gregorian calendar's measurement. road and water communications were reorganized and improved. to provide against possible famines, granaries were ordered built throughout the empire. the city of beijing was rebuilt with new palace grounds that included artificial lakes, hills and mountains, and parks. during the yuan period, beijing became the terminus of the grand canal of china, which was completely renovated. these commercially oriented improvements encouraged overland and maritime commerce throughout asia and facilitated direct chinese contacts with europe. chinese travelers to the west were able to provide assistance in such areas as hydraulic engineering. contacts with the west also brought the introduction to china of a major food crop, sorghum, along with other foreign food products and methods of preparation. <SEP> Wang Chong (; 27 – c. 100 AD), courtesy name Zhongren (仲任), was a Chinese meteorologist, astronomer, and philosopher active during the Han Dynasty. He developed a rational, secular, naturalistic and mechanistic account of the world and of human beings and gave a materialistic explanation of the origin of the universe. His main work was the "Lunheng" (論衡, "Critical Essays"). Wang also accurately described the process of the water cycle. This book contained many theories involving early sciences of astronomy and meteorology, and Wang Chong was even the first in Chinese history to mention the use of the square-pallet chain pump, which became common in irrigation and public works in China thereafter. <SEP> Staple foods in Tibet are roasted barley, yak meat, and butter tea. The economy of Tibet is dominated by subsistence agriculture, though tourism has become a growing industry in recent decades. The dominant religion in Tibet is Tibetan Buddhism; in addition there is Bön, which is similar to Tibetan Buddhism, and there are also Tibetan Muslims and Christian minorities. Tibetan Buddhism is a primary influence on the art, music, and festivals of the region. Tibetan architecture reflects Chinese and Indian influences. <SEP> The late Turrell V. Wylie, a former professor of the University of Washington, and Li Tieh-tseng argue that the reliability of the heavily censored History of Ming as a credible source on Sino-Tibetan relations is questionable, in the light of modern scholarship. Other historians also assert that these Ming titles were nominal and did not actually confer the authority that the earlier Yuan titles had. Van Praag writes that the "numerous economically motivated Tibetan missions to the Ming Court are referred to as 'tributary missions' in the Ming Shih." Van Praag writes that these "tributary missions" were simply prompted by China's need for horses from Tibet, since a viable horse market in Mongol lands was closed as a result of incessant conflict. Morris Rossabi also writes that "Tibet, which had extensive contacts with China during the Yuan, scarcely had diplomatic relations with the Ming." <SEP> the columbia encyclopedia distinguishes between the yuan dynasty and the other mongol empire khanates of ilkhanate, chagatai khanate and the golden horde. it describes the yuan dynasty as "a mongol dynasty of china that ruled from 1271 to 1368, and a division of the great empire conquered by the mongols. founded by kublai khan, who adopted the chinese dynastic name of yüan in 1271." the encyclopedia americana describes the yuan dynasty as "the line of mongol rulers in china" and adds that the mongols "proclaimed a chinese-style yüan dynasty at khanbaliq (beijing)." the metropolitan museum of art writes that the mongol rulers of the yuan dynasty "adopted chinese political and cultural models; ruling from their capitals in dadu, they assumed the role of chinese emperors," although tibetologist thomas laird dismissed the yuan dynasty as a non-chinese polity and plays down its chinese characteristics. the metropolitan museum of art also noted that in spite of the gradual assimilation of yuan monarchs, the mongol rulers largely ignored the literati and imposed harsh policies discriminating against southern chinese. in his kublai khan: his life and times, rossabi explains that kublai "created government institutions that either resembled or were the same as the traditional chinese ones", and he "wished to signal to the chinese that he intended to adopt the trappings and style of a chinese ruler".