40 years ago today Channel 0 turned into 10.
According to Wikipedia, on 20 January 1980, the 0/10 Network became known as Network Ten to reflect ATV moving from channel 0 to channel 10 – although the Brisbane station continued to broadcast as TVQ-0 until 10 September 1988 when the station changed to TVQ-10.
It was also the launch date of the ill-fated soap, Arcade. It lasted all of 6 weeks.
You can read more on these at the Television.AU website.