A day is one seventh of a week.
February 3, 1947 fell on a Monday of that week.
monday
It was a Monday.
Tuesday
Feb 3 1959 was a Tuesday.
It was a Friday.
It was a Tuesday.
Wednesday
It was a Wednesday.
March 3, 1959 fell on a Tuesday.
September 3, 1959 fell on a Thursday.
June 3rd, 1959 was a Wednesday.
It was a Friday.
Saturday
It was a Saturday.
January 3, 1969 was a Friday.