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Boys' Book of Astronomy

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...there is no doubt it is entirely owing to this addition to the observatory that so many have been found. Before the photographic plate was invented the astronomer who would hunt for minor planets had first to carefully construct maps of all the stars visible in the particular zone which he decided to explore. This in ...