天文航行指通过天文观测推算船只位置的航海导航方法。航行者通过六分仪测量极星高度可以推算出所在地纬度;观测星体的地方时角并配合天文钟计算经度,从而完成海上定位。天文航海具有全球覆盖、误差稳定、独立性好的优点;但受天气影响较大。

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