As the star sensor of ballistic missile works only for short time, the navigation stars in the missile can be reduced to 30, and the convex polygons can be reduced to 75 for different trajectories.

为此，设计了以导航星凸多边形和观测凸多边形之间距离最小为准则的识别算法。针对星光制导的导弹观星时间很短，提出了根据弹道生成弹上导航星表的方法，其导航星表只需存储30颗星的75 个凸多边形。

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Islanders from all over the Pacific learned to use the stars for navigation, and they passed this knowledge down from generation to generation.

来自太平洋各地的岛民学会了用星星来导航，并且他们将这一知识代代相传。

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When a plot takes a long, tortuous route, then-as any mariner will tell you-stars are essential for navigation.

当电影情节沿着一条漫长而拐弯抹角路线展开时，正如很多海员会跟你讲的那样，“明星”是航行中最必不可少的。

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In 1675, the foundation stone of the Royal Observatory was laid at Greenwich in south London by order of King Charles II, to improve knowledge of the positions of stars and thus aid navigation.

CNN: Sunday,

Indeed he probably believed that the stars were more useful for horoscopes than for navigation, but he was refreshingly open to new ideas.

ECONOMIST: Historical biography