绘制地图

• In 1416 , when he was twenty two , henry founded a school for mariners , to which he invited everyone who could help him jewish astronomers , italian and spanish sailors , and arab mathematicians and map makers who knew how to use the crude compass of the day and could improve it
  在1416年，他22岁的时候，亨利邀请了所有能帮助他的人，有犹太天文学家、意大利和西班牙海员、阿拉伯数学家和知道怎么使用和改进罗盘的绘制地图人员建立了一个海员学校。