RT @hist_astro: Happy Birthday to Henrietta Swan Leavitt, born #OTD in 1868. One of Harvard College Observatory’s female “computers”. http://t.co/Ir3lOFXsFx
RT @hist_astro: Happy Birthday to Henrietta Swan Leavitt, born #OTD in 1868. One of Harvard College Observatory’s female “computers”. http://t.co/Ir3lOFXsFx