水手博物馆有大量非常古老的收藏 - 古老的导航工具。其中包括探索画廊时代的星棒标准,象限,跨人员,后勤人员,八分之一和六分之一的八个画廊。可以在勘探画廊时代,这是估计地平线上天体高度的最早设备之一。该观察结果使古代人走上了我们“现代”导航员使用的轨道,直到卫星,计算机和GPS使天体导航的令人满意而优雅的艺术过时。
The earliest astronomers through painstaking and detailed observations and record-keeping recognized that the stars seemed to rotate about a single star in the heavens, Polaris, in the constellation Ursa Minor. The ancients eventually realized that the angular elevation (altitude) of Polaris above the horizon corresponded almost exactly with the latitude on the earth from which the altitude measurement was made. From the altitude of Polaris, and a few corrections the Latitude can be easily calculated. (Corrections are necessary since Polaris is not exactly due north, in fact, because of precession of the earth’s axis, Polaris was not always and will not always be the North Star. Around 14,000 CE, the star Vega will be in that position for 500 or 1000 years.)阅读更多
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