| 書目名稱 | The Moon that Wasn‘t | | 副標(biāo)題 | The Saga of Venus‘ S | | 編輯 | Helge Kragh | | 視頻video | http://file.papertrans.cn/915/914302/914302.mp4 | | 概述 | First book ever that recounts the story of Venus’ moon and provides it the place in the history of astronomy that it deserves.Meticulously documented and based on a large collection of primary sources | | 叢書名稱 | Science Networks. Historical Studies | | 圖書封面 |  | | 描述 | The planet Venus is the closest neighbour to the Earth and in several respects similar to our globe. It revolves around the Sun at an average distance of 0. 72 astronomical units, in an elliptical orbit of eccentricity 0. 007. The corresponding 3 numbers for the Earth are 1 and 0. 017. The mean density of Venus is 5. 2 g/cm , 3 that of the Earth 5. 5 g/cm . Venus’ acceleration of gravity at its equator is 8. 9 2 2 m/s , compared with 9. 8 m/s at the Earth. The escape velocity is 10. 4 km/s, while the corresponding ?gure of the Earth is 11. 2 km/s. Although the mass of Venus is somewhat smaller than that of the Earth – the ratio is M /M =0. 815 V E – the diameters of the two planets are almost the same. In other words, Venus is indeed a sister planet of the Earth. In earlier times, when almost nothing was known about the physical con- tions of Venus, the similarity appeared even stronger than today. Not only was Venus’ period of rotation thought to be close to that of the Earth, it wasalso p- sible (and indeed common) to imagine intelligent life on Venus. | | 出版日期 | Book 2008 | | 關(guān)鍵詞 | 18th century; Venus; astronomy; history of astronomy; moon; planet | | 版次 | 1 | | doi | https://doi.org/10.1007/978-3-7643-8909-3 | | isbn_ebook | 978-3-7643-8909-3Series ISSN 1421-6329 Series E-ISSN 2296-6080 | | issn_series | 1421-6329 | | copyright | Birkh?user Basel 2008 |
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