That question would be impossible to answer as there were a huge amount of newspapers printed, and tv and radio news stories broadcast all around the world on that day, with a huge variety of headlines.
21st July 1977 was a Thursday.
21st July 1969 was a Monday.
21st July 1970 was a Tuesday.
21st July 2010 is a Wednesday.
July 21st, 1959 fell on a Tuesday.
July 21st, 1977 fell on a Thursday.
July 21st, 2001 fell on a Saturday.
This depends on the year. July 21st has occurred on every day of the week.
July 21st to august 21st
Broadway to Hollywood Headline Clues - 1949 was released on: USA: 20 July 1949
21st July
July 16, 1973 fell on a Monday.