他剪短 发表于 2025-3-21 17:03:13
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Meridian Passage and , or 000°) from the observer. The position line obtained, being at right-angles to the bearing, will instantly give the observer’s latitude. Although sights can be taken for the meridian passage of any heavenly body, it is normally only observed for the Sun. Occasionally, Jupiter and Venus may also be usefully observed by day.panorama 发表于 2025-3-22 16:23:18
https://doi.org/10.1007/978-3-031-47542-9Ocean navigation; Coastal navigation; Celestial navigation; Maritime technology; Naval technology; Ship nProtein 发表于 2025-3-22 19:46:33
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Springer Series on Naval Architecture, Marine Engineering, Shipbuilding and Shippinghttp://image.papertrans.cn/i/image/473502.jpgObsequious 发表于 2025-3-23 05:18:45
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Refraction, Dip and Mirage,properties. Thus, the speed of light in a vacuum is ‘c,’ but a light ray travelling through water will travel at an appreciably lower velocity, and in some peculiar forms of matter it is possible for light to travel at only a few meters per second.