BROTH
发表于 2025-3-28 16:19:07
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Parley
发表于 2025-3-28 19:03:31
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chandel
发表于 2025-3-29 02:17:15
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歌剧等
发表于 2025-3-29 05:07:26
The Investigation of Stars, Star Clusters and Nebulae in ’Abd al-Raḥmān al-Ṣūfī’s , work was developed from Ptolemy’s ., but was based upon al-Ṣūfī’s own stellar observations. The . has been copied down through the ages, and currently 35 copies are known to exist in various archival repositories around the world..In this paper we begin with a brief introduction to the . and provid
猜忌
发表于 2025-3-29 10:22:33
’Abd al-Raḥmān al-Ṣūfī’s 3-Step Magnitude Systemth a very brief introduction to the . This book contains an extensive star catalogue that lists star coordinates and magnitude estimates for all of the Ptolemaic stars. However, in his book al-ḥūfī utilized three distinct intermediate magnitude values whereas Ptolemy only mentioned two. We believe t
爱哭
发表于 2025-3-29 14:32:13
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扔掉掐死你
发表于 2025-3-29 15:52:36
Some Statistical Aspects of Historical Chinese Astronomy Records sunspots, have been used to investigate solar activity, returns of periodic comets, the rotation of the Earth and the ages of supernova remnants, to mention some of the most notable studies. The reliability of the recorded data has been tested using determinable events (such as planetary conjunctio
parsimony
发表于 2025-3-29 23:36:29
The Clash Between William Herschel and the Great German ‘Amateur’ Astronomer Johann Schroeterm Herschel, who began his career as a musician but became a salaried employee of the British Crown, clashed metaphorical swords for many years with Germany’s greatest amateur astronomer, Johann Schroeter. Each possessed the largest telescope in England and Germany, respectively. Schroeter began in t
渐变
发表于 2025-3-30 03:40:42
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Organonitrile
发表于 2025-3-30 04:06:30
Portuguese Amateur Astronomy (1850–1910)gical and social conditions. Throughout the nineteenth century two opposing trends were at play. On the one hand, the professionalisation of science and the rising cost of first class instruments led to a reduced number of research fields available to amateurs. On the other hand, an increased educat