Annie Jump Cannon By reheend Dec 11, 1863 Cannon was born Period: Dec 11, 1863 to Apr 13, 1941 Cannon's Life Nov 14, 1896 Worked at Harvard College Observatory She developed teh OBAFGKM classifcation system for classifying stars by spectra, which is a system stillused today. Nov 14, 1938 Obtained a regular Harvard appointment as William C Bond Astronomer Apr 13, 1941 Cannon's death date