Event:
Rogers Hornsby replaces Branch Rickey as manager of Cardinals
More Notable Events on May 30:
1975 European Space Agency, ESA, forms
1971 U.S. Mariner 9, 1st satellite to orbit Mars launched
1966 U.S. launches Surveyor 1 to Moon
1901 Memorial Day 1st observed in U.S.
1848 William G. Young patents ice cream freezer
