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His star catalogue, Historia Coelestis Britannica (1725), listed more stars (3,000)
and gave their positions much more accurately than any other previous work.
Some stars, such as 61 Cygni, are still known by their numbers in his system.
The arms are thought to represent waves of increased density 0 galactic material,
dust and gas, in which stars form by condensation; alternatively, the arms may be
streams of matter being ejected from the spinning nucleus and assuming ...
933 Harvard University Harvard classification system, for stars, divides them into
types according to their temperatures as estimated from their spectra. In the
1860s the Italian astronomer Angelo Secchi distinguished four main spectral
types of ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review