The Great Star Map, Being of Brief General Account of the International Project Known As the Astrographic Chart
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In our eReader you can find the full English version of the book. Read The Great Star Map, Being of Brief General Account of the International Project Known As the Astrographic Chart Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Great Star Map, Being of Brief General Account of the International Project Known As the Astrographic Chart
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This bifurcation of the enter- prise was subsequently developed in both prongs. To the shorter exposure two others shorter still, of 3 minutes and 20 seconds, were afterwards added, for good reasons which we need not stop to notice : and the longer exposure of 15 minutes was extended to 20 minutes, then to 30 minutes, then to 40 minutes, and ultimately to one hour, VARIOUS EXPOSURES 59 subdivided into three separate exposures each of 20 minutes. We need not follow the reasons in detail, it is s...ufficient to re- mark that for the originally projected uni- form exposure of 15 minutes a series has been substituted, for reasons more or less good, of four or five exposures ranging from 20 seconds to 40 minutes. The ratio of 120 to 1 between the longest and shortest corre- sponds roughly to 7 stellar magnitudes, and hence we have material for studying the variation of total number of stars per plate over a considerable range.
The particular proposal to give three separate exposures of 20 minutes each has had an unexpected result of an interesting kind.
What to read after The Great Star Map, Being of Brief General Account of the International Project Known As the Astrographic Chart?
You can find similar books in the "Read Also" column, or choose other free books by Turner, H. H. (Herbert Hall), 1861-1930 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This bifurcation of the enter- prise was subsequently developed in both prongs. To the shorter exposure two others shorter still, of 3 minutes and 20 seconds, were afterwards added, for good reasons which we need not stop to notice : and the longer exposure of 15 minutes was extended to 20 minutes, then to 30 minutes, then to 40 minutes, and ultimately to one hour, VARIOUS EXPOSURES 59 subdivided into three separate exposures each of 20 minutes. We need not follow the reasons in detail, it is s...ufficient to re- mark that for the originally projected uni- form exposure of 15 minutes a series has been substituted, for reasons more or less good, of four or five exposures ranging from 20 seconds to 40 minutes. The ratio of 120 to 1 between the longest and shortest corre- sponds roughly to 7 stellar magnitudes, and hence we have material for studying the variation of total number of stars per plate over a considerable range.
The particular proposal to give three separate exposures of 20 minutes each has had an unexpected result of an interesting kind.
What to read after The Great Star Map, Being of Brief General Account of the International Project Known As the Astrographic Chart?
You can find similar books in the "Read Also" column, or choose other free books by Turner, H. H. (Herbert Hall), 1861-1930 to read onlineMoreLess
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