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The less said about Chinese maps and map-making the better History is also distorted in that the Chinese like to keep very quiet about the subjugation of Mother Of Monarchs Butterfly Lover Insect Butterflies T Shirt their country for about two hundred years by the Mongols in the 12th century CE; nor indeed about their coming under the Manchu Empire from the middle of the 17th century. So far as available history suggests, it is seen that it was the visits and the presence of Jesuit priests overland through Central Asia in the 15th century that led to a tentative start to map-making in China. But the standard of their map-making first came to public knowledge during the Simla Conference in 1914, when the Chinese Ambassador, Ivan Chen, was hard pressed to produce any map that could be used during the negotiations with his Tibetan counter-part, Lobsang Satra, and the British diplomat, Sir Henry Macmahon. This became more apparent during the India-China diplomatic exchanges in 1960–61 when the Indian side was able to produce maps of the border having a scale of 4 miles to an inch (thanks to work of the Survey of India since the mid 19th century) where the best that the Chinese could produce were some maps of a scale of one inch for sixteen miles.

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One advantage of the numerous distance-measuring schemes in use, which overlap over a range of The Dropout seen shirt from nearby to very distant, is that astronomers can calibrate and corroborate their measurements with multiple approaches. Such calibrations and corroborations thus lend an additional measure of reliability to these schemes. Indeed, by comparing results using different methods, weaknesses have been identified in certain schemes. In most cases, additional studies have demonstrated ways to guard against and correct for known difficulties. As a single example of these multiple approaches, prior to 2011 the distance to the Pinwheel Galaxy was determined, based on measurements of Cepheid variable stars in the galaxy, to be 20.9 million light-years, with an uncertainty of 1.8 million light-years. As of September 2011, measurements of the light output of the 2011 Type Ia supernova in the Pinwheel Galaxy are completely consistent with this distance figure…. In short, distances to astronomical objects can be and have been measured with substantial accuracy and reliability. For the most part, the calculations involved employ only basic mathematics taught in high school. Thus the overall conclusion of a universe consisting of billions of galaxies, most of them many millions of light-years away, is beyond reasonable doubt at the present time..

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