While his system was superseded by the Harvard system , he still stands as discoverer of the principle of stellar classification , which is a fundamental element of astrophysics .
From this concept , he developed the first system of stellar classification : the five Secchi classes .
While his system was superseded by the Harvard system , he still stands as discoverer of the principle of stellar classification , which is a fundamental classification of astrophysics .
From this concept , he developed the first system of stellar classification : the five Secchi classes .