November 23, 1959 was a Monday.
January 23, 1958 fell on a Thursday.
August 14, 1986 was a Thursday.
At the equinoxes - around 21 May, and 23 September.
The first Mole Day theme was "Count on Chemistry." It was celebrated on October 23, 1991.
October 23 2009 was a Friday.
January 23 2009 was a Friday.
It was a Tuesday.
It was a Sunday.
May 23, 2000 was a Tuesday.
May 23, 1932 was a Monday.
May 23, 1977 was a Monday
May 23, 1992 was a Saturday.
May 23, 1981 was a Saturday.
May 23, 1974 was a Thursday.
May 23, 1978 was a Tuesday.
May 23 1967 was on a Tuesday.