Today - December 11th - marks the 153rd anniversary of the birth of the remarkable Annie Jump Cannon. Oh! Be a fine girl (guy) - kiss me! This is the traditional mnemonic for the way stars are classified: OBAFGKM. Find out about the astronomer and suffragette who devised the system and who said that astronomical spectroscopy made it "almost as if the distant stars had acquired speech."
Two years ago Annie Cannon's birthday was commemorated by a Google doodle. Somewhat sadly, although her reputation was international, the doodle was only featured on search pages in the USA.
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