变化
发表于 2025-3-28 16:00:58
Book 19941st edition. We feel that this is a unique publication in that it contains valuable material that cannot easily-if at all-be found elsewhere. We are grateful to the authors for reading through the English version of the text, and for responding promptly (for the most part) to our queries. Several authors have
arrhythmic
发表于 2025-3-28 21:55:11
Introduction to Astronomical Literature and Nomenclature,s, and also all of time back to the origin of the Universe as deduced from stellar dating and cosmological theory. Apart from meteorites and the very nearest celestial bodies which can be reached directly by spacecraft, astronomical researchers are spatially separated from the objects of their study
芳香一点
发表于 2025-3-29 00:15:03
Fundamentals of Spherical Astronomy,na which occur on the celestial sphere. This is a field that today is often neglected, and yet it is still the foundation of many branches of astronomy for observations and research, even if this is not always clearly evident. Every observer is confronted with problems involving spherical astronomy
茁壮成长
发表于 2025-3-29 04:42:52
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绕着哥哥问
发表于 2025-3-29 09:58:16
Optical Telescopes and Instrumentation,cording device, be it a conventional photographic plate, a sophisticated electronic detector, or merely the human eye. This may be achieved by enhancing the light-collecting area or by sharper imaging, with the aims of improved angular resolution in order to separate closely adjacent objects and hig
buoyant
发表于 2025-3-29 11:25:04
Telescope Mountings, Drives, and Electrical Equipment,ounting. The telescope mounting is a complex structure of many parts and is far less easily comprehended than the optical path in the telescope; some parts are even more difficult for the amateur telescope maker to manufacture than a primary mirror. Thus, the major problem has always been the manufa
CAND
发表于 2025-3-29 15:38:11
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软膏
发表于 2025-3-29 21:59:44
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Bumptious
发表于 2025-3-30 01:43:54
Principles of Photometry,incident radiation is described completely by its flux, its direction, its color (wavelength), its polarization, the time of arrival, and—in certain cases—also by the location of the receiver. Photometry involves the measurement of radiation summed over a more or less extended wavelength region. Dep
油毡
发表于 2025-3-30 06:19:23
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