广大
发表于 2025-3-23 11:04:48
The Observation of Star Occultations,the position of the Moon, and thus to the determination of ., that is, an improved Sidereal Time, in which the small irregular fluctuations in the Earth’s rotation, which serves as a clock, can be eliminated by a comparison with the motion of the Moon. For a detailed discussion of this time problem we refer particularly to special publications..
Vulnerary
发表于 2025-3-23 16:24:34
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Dappled
发表于 2025-3-23 18:01:06
,Natürlich vorkommende Chromone,onquest of celestial motions, the term astronomical accuracy has become a household word, the reason lies in the fact that these calculations can be based on a large amount of observed data and on a careful consideration of all possible sources of error.
绕着哥哥问
发表于 2025-3-24 00:42:16
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hereditary
发表于 2025-3-24 03:39:51
Introduction to Astronomical Literature and Nomenclature,onquest of celestial motions, the term astronomical accuracy has become a household word, the reason lies in the fact that these calculations can be based on a large amount of observed data and on a careful consideration of all possible sources of error.
interrupt
发表于 2025-3-24 06:34:06
Observation of the Planets,this field still has a special, if restricted, value, as long as the observer concerns himself only with fields appropriate to his possibilities, say regular surveys, and provided he possesses the necessary personal and instrumental equipment.
慢跑鞋
发表于 2025-3-24 11:51:50
Book 19751st editionends of astronomy. In our space age, astronomical knowledge arouses public interest more and more. Practical observation at the telescope depends more than anything else on such knowledge. The educational value of such a training is undisputed. On the other hand, the work of the amateur astronomer c
相信
发表于 2025-3-24 15:33:00
by all friends of astronomy. In our space age, astronomical knowledge arouses public interest more and more. Practical observation at the telescope depends more than anything else on such knowledge. The educational value of such a training is undisputed. On the other hand, the work of the amateur as
考得
发表于 2025-3-24 20:40:57
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政府
发表于 2025-3-24 23:28:18
The Observing Instruments of the Amateur Astronomer,ndirectly, so as to achieve a clear impression; to make invisible radiation visible; to see clearly what has only been received blurred; to separate double images from what appears single; to determine directions; and to measure angular distances. Indeed, every optical instrument serves several of these purposes.