神经
发表于 2025-3-23 12:23:00
Introducing the Celestial Sphere,To an observer on the Earth, the sky has the appearance of an inverted bowl, in the sense that the stars and other heavenly bodies, irrespective of their actual distance from the Earth, appear to be situated on the inside of a sphere of immense radius described about the Earth as centre.
外向者
发表于 2025-3-23 15:46:38
Time Systems,The world is divided into 24 standard time zones. The term . is the generic term for all time zones within the ‘Uniform Time System’, both on land and at sea. Each zone is 15° wide, with each zone numbered and lettered.
Optic-Disk
发表于 2025-3-23 18:15:39
Observing Celestial Sights Using an Artificial Horizon,In certain circumstances, the horizon may not be visible, and thus traditional methods of taking observations will not be possible. When observing from a static position (i.e., not a rolling and pitching ship), it is possible to use the artificial horizon or ‘syrup’ method to take Sun sights.
渗透
发表于 2025-3-24 02:08:18
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ticlopidine
发表于 2025-3-24 06:22:34
Sky at Night,The 58 ‘navigational stars’ are illustrated in Fig. .. The red line indicates the most convenient route for identifying one star from another, if observing them without instruments.
向外供接触
发表于 2025-3-24 09:02:36
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针叶类的树
发表于 2025-3-24 13:30:23
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confide
发表于 2025-3-24 15:47:41
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FLAGR
发表于 2025-3-24 22:58:21
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Brochure
发表于 2025-3-25 01:30:19
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