single
发表于 2025-3-25 04:26:44
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缩影
发表于 2025-3-25 08:28:33
The Moon, binoculars or a small telescope will allow lunar features to be resolved in reasonable detail, and many good maps are available for guidance (e.g. Rükl, 1991; Hatfield, 1968). The Moon presents an essentially unchanging face, and its captured rotation means that only 59% of the lunar terrain is vis
保存
发表于 2025-3-25 14:31:14
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错误
发表于 2025-3-25 17:33:14
Small Bodies of the Solar System,the astronomical observer. Meteor activity, produced by small particles – meteoroids – usually of cometary origin, has already been discussed (Chapter 2). Further small bodies of interest are the asteroids (or minor planets), planetary satellites and comets. Since asteroids and satellites are in gen
干涉
发表于 2025-3-25 20:04:49
Comets, comets may come within range of amateur telescopes, maybe a couple of which might even be sufficiently bright to be seen with the aid of 10 × 50 binoculars. Most are rather faint, and require skill and patience if they are to be observed. Certainly, few come to resemble the popular image, with a lo
Prosaic
发表于 2025-3-26 00:48:35
Variable Stars,ility. In most instances the variations are either too slow (of the order of months, years or decades) or too subtle (fractions of a magnitude) to be included in any discussion of readily observable transient astronomical phenomena. None the less, there is much value in systematic, long-term series
Solace
发表于 2025-3-26 07:45:04
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cacophony
发表于 2025-3-26 12:13:18
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Accommodation
发表于 2025-3-26 16:00:30
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frugal
发表于 2025-3-26 20:37:52
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