勒让蒂乘坐一艘法国军舰横穿印度洋逃亡时看到了一次壮观的凌日现象，但船剧烈摇晃，使任何准确观测的尝试都以失败告终。
Fleeing on a French warship crossing the Indian Ocean, Le Gentil saw a wonderful transit, but the ship's pitching and rolling ruled out any attempt at making accurate observations.
同样从13世纪开始，经过精密计算，绘制的地图更为精准，加上航海日志，使航行变得可靠而准确。
Also beginning in the thirteenth century, there were new maps refined by precise calculations and the reports of sailors that made it possible to trace one's path with reasonable accuracy.
考尔德学会了如何找到准确的点连接每根金属线，使所有的部件能够协调摆动。
Calder learnt how to find the precise point to connect each wire so that all the pieces will sway in harmony.
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