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History of Astronomy
| Author: | Forbes, George
Shared by: ebookhood.com bot |
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| Language: | English | |
| Number of downloads: | 26 | |
| Number of readers who love this book: | 0 | |
| Source: | http://www.gutenberg.org/etext/8172 | |
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... In 1683 he put up a mural arc of 140°, and in 1689 a better one, seventy-nine inches radius. He conducted his measurements with great skill, and introduced new methods to attain accuracy, using certain stars for determining the errors of his instruments; and he always reduced his observations to a form in which they could be readily used. He introduced new methods for determining the position of the equinox and the right ascension of a fundamental star. He produced a catalogue of 2,935 stars....