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许多世纪以来,科学家和航海家们为获得经、纬度而进行了坚持不懈的努力。在古希腊,早就有通过测定月蚀结束时间来获得经度的想法。1494年克里斯托佛·哥伦布曾试图利用这种方法远离海岸,但失败了。1805年梅林韦瑟·刘易斯在向太平洋的冒险航行途中,曾笨拙地利用月蚀确定其所在位置到英国格林威治的距离。1612年意大利科学家伽利略建议用木星的4颗明亮的卫星作为天体钟来获得经度,这种方法要求对着木星卫星的望远镜稳定不动,在大海中航行的舰船
For many centuries, scientists and navigators have worked tirelessly to gain latitude and longitude. In ancient Greece, longitudes of longitude were measured by measuring the end of a lunar eclipse. In 1494 Christopher Columbus tried to use this method to stay away from the coast but failed. In 1805 Merlin Wayne Lewis, on his voyage to the Pacific, clumsily used lunar eclipses to determine the distance from his location to Greenwich, England. In 1612 Galileo, an Italian scientist, proposed to acquire longitude using four bright satellites of Jupiter as the celestial body clock. This method requires the stability of the telescope facing Jupiter’s satellites and the ships navigating in the sea