CarveHerName, 1 month ago #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
#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