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This article is divided into the following sections: I. Astronomy Methods of study
Component disciplines and their relationship to other sciences Investigation of
the scale of the universe and of the distribution of objects within it Orbit theory II.
From measurements with Venus since 1961 the astronomical unit has been
found to a precision of about 100 kilometres (limited by knowledge of the speed
of light) and is close to 149,597,900 kilometres (92,975,699 miles). Time-delay ...
Radio astronomy has also created some of the most impressive astronomical
instruments existing today, both dishes and interferometers. To measure angular
diameters much less than 1" of arc — e.g., for hydroxyl (OH) emission sources
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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