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#OnThisDay, 9 May 1922, the International Astronomical Union formally adopts Annie Jump Cannon's stellar classification system. The principles in it still underpin modern classification.

#WomenInHistory #OTD #History #WomensHistory #Astronomy #WomenInSTEM #AmericanHistory #Histodons

Annie Jump Cannon sat at a desk. She is clearly not a fan of a clear desk policy as it's messy with papers and open drawers. She is a white woman with pale hair.
#History #OnThisDay #astronomy #otd #histodons #womeninstem #americanhistory #womeninhistory #womenshistory
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