On this day in 1937 The Guiding Light debuted on NBC radio from Chicago. It would move to CBS television in 1952 and remain there until it ended on September 18th, 2009. It ran for a total of 72 years on radio and television. The Guinness Book of World Records credits The Guiding Light as the longest running drama in television history. That is over 18,000 episodes of The Guiding Light that were produced. It was cancelled due to low ratings in 2009.