Henrietta Swan Leavitt July 4, 1868- December 12, 1921 Discovered that period of fluctuation in brightness is regular and a result of the luminosity of the star Determined magnitude of 108 stars (jul 4, 1868 – dec 12, 1921)
Added to timeline:
Date:
jul 4, 1868
dec 12, 1921
~ 53 years