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 (4 lugl 1868 anni – 12 dic 1921 anni)
Aggiunto al nastro di tempo:
Data:
4 lugl 1868 anni
12 dic 1921 anni
~ 53 years