中文注释:从Mont-Saint-Michel(圣米歇尔山)反射来的可用作测量的光线,在18世纪,Jacques Cassini(雅克 卡西尼)和他的儿子César-Francois(C.F.卡西尼,也称蒂里的卡西尼)就是用这样的方法测量并绘制了高精度的法国地形图。他们从巴黎的最高点开始,设置了可准确测量距离的地标。在圣米歇尔山,这些从四个不同的点而来的光线,汇集到这座中世纪教堂顶端的三棱镜处。从1744年起,卡西尼家族就用400多个这样的三棱镜测绘了这个国家。作者: Bob Sacha
圣米歇尔山 光 法国 图片故事:高清壁纸:英文注释:Mont-Saint-Michel Light Show, France, 1998"Light reflected from nylon thread near Mont-Saint-Michel illustrates triangulation, the method Jacques Cassini and his son César-Fran?ois used to survey 18th-century France. Starting from the Paris meridian, they sighted off high landmarks to accurately measure distance. At Mont-Saint-Michel, the lines of sight from four vantage points met in the apexes of three triangles at the steeple of the medieval abbey. By 1744 the Cassinis had crisscrossed the country with 400 such triangles." 随机推荐: |
