What is the origin of the letters used in star classification? Why didn't astronomers use ABCD? J. HaldimanChicago, Illinois Stellar spectral types originally followed alphabetical order. But as ...

The following is an excerpt from The Glass Universe: How the Ladies of the Harvard Observatory Took the Measure of the Stars, by Dava Sobel. The monumental work of stellar classification known as the ...

IN all my early work at Kensington (1887) on the classification of stars according to their spectra,. the best basis for a classification was chiefly considered. The data available were the chemical ...