Studies Based on the Colours and Magnitudes in Stellar Clusters.
First Paper: The General Problem of Clusters. Second Paper: Thirteen Hundred Stars in the Hercules Cluster (Messier 13). Third Paper: A Catalogue of 311 Stars in Messier 67. Contributions from the Mount Wilson Solar Observatory Nos. 115, 116, and 177.
First separate edition. The first three papers in Harlow Shapley’s monumental, multi-part analysis of globular clusters of stars, from which he estimated the size and shape of the Milky Way galaxy. Though his final estimate was off due to the dimming of the clusters by dust clouds, he was the first to realise that the Milky Way was much larger than believed and that our solar system was on its periphery, not at the centre. This is now a key part of the Copernican principle, which states that the Earth is not in a favoured position in the universe.
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Octavo. Original light greenish-blue wrappers printed in black. Charts and diagrams throughout. Light dampstain to edge of upper wrapper, wrappers a little rubbed at the edges with a couple of short splits to the upper wrapper, contents faintly toned in the margins. An excellent copy.