The Northern Territory Flag was flown for the first time at the ceremony in Darwin on 1 July 1978 which marked the grant of self-government to the Northern Territory. The flag-raising ceremony was held on the Esplanade, overlooking Darwin Harbour, and was acknowledged with a 19-gun salute from HMAS Derwent.
The Northern Territory flag was designed by prominent Australian artist, Robert Ingpen, of Drysdale Victoria. Mr Ingpen's work is well known throughout Australia and includes murals in important public buildings and several postage stamp designs, including the Cook Bi-Centenary series. In designing the Northern Territory flag Mr Ingpen used as a basis a number of suggested designs submitted by members of the public at the invitation of the Northern Territory Government
Reference: Official N.T. Website