BBC Ceefax, the world's first teletext service, has completed its final broadcast after 38 years on air.
Before Olympic champion Dame Mary Peters turned off the last of the UK's analogue TV signals in Belfast, a series of graphics on Ceefax's front page disappeared down to a small dot.
The Plain English Campaign earlier gave Ceefax a lifetime achievement award for "clarity" and use of "everyday words".
And ex-Prime Minister Sir John Major said Ceefax would be "much missed".
Sir John, who has previously revealed that he regularly checked Ceefax pages between Downing Street meetings to keep up to date with cricket scores, said: "Ceefax will be much missed. At moments of high pressure - with little time for detailed examination of the news - Ceefax headlines offered an instant window on the world.
"From breaking global news to domestic sports news, Ceefax was speedy, accurate and indispensable. It can be proud of its record."
A few weeks after Ceefax provided coverage of its 10th and final Olympic Games, Lord Coe added his own tribute by saying: "Ceefax has been an invaluable news service for every sports fan over the last 38 years.
"I have checked in on many a sports news story, track and field triumph and, of course, Chelsea results!"
Ceefax was launched on 23 September 1974 to give BBC viewers the chance to check the latest news headlines, sports scores, weather forecast or TV listings - in a pre-internet era where the only alternative was to wait for the next TV or radio bulletin to be aired.
Its premise was to give viewers free access to the same information that was coming into the BBC newsroom, as soon as the BBC's journalists had received it.
Ceefax had initially been developed when BBC engineers, exploring ways to provide subtitles to enable viewers with hearing problems to enjoy BBC TV programmes, found it was possible to transmit full pages of text information in the "spare lines" transmitted on the analogue TV signal.
The BBC then appointed veteran journalist Colin McIntyre, its former UN correspondent and chief publicity officer, as the first editor of a news and information service which was broadcast using the same method.
It was called Ceefax, simply because viewers would be able to quickly "see the facts" of any story of the day.
McIntyre initially updated 24 news pages on his own, feeding punch tape into machines, before recruiting Ceefax's first eight journalists.
Initially the service was a minority interest, with just a handful of Ceefax-capable TVs in the UK, but it slowly started to gain popularity and the engineering team that developed the service was honoured with a Queen's Award for innovation.
But the real impetus for viewers came when BBC Television decided to use a selection of Ceefax pages, accompanied by music, before the start of programming each day. Initially called Ceefax AM and Ceefax In Vision, the Pages From Ceefax "programme" continued for 30 years, being broadcast overnight on BBC Two until this week.
As viewers got a small taste of what Ceefax had to offer, millions of Britons during the 1980s invested in new teletext-enabled TV sets which gave them access to the full Ceefax service, which by now included recipe details for dishes prepared on BBC cookery shows, share prices, music reviews and an annual advent calendar.
Its audience peaked in the 1990s when it had 20 million viewers who checked the service at least once a week. Since the launch of the National Lottery in 1994, dozens of jackpot winners have revealed that they first learned their life had been changed when they checked their numbers on Ceefax.
But the launch of the UK's TV digital signal, and the announcement that the analogue TV signal would disappear in a staged switch-off over five years, meant a slow withdrawal of Ceefax, ending with the final broadcast in Northern Ireland.
BBC Northern Ireland and UTV screened a simulcast reviewing the era of analogue TV, and then Dame Mary Peters - 1972 Olympic gold medallist in the pentathlon - pressed the button to change the television landscape.
The hour-long special programme, The Magic Box, was hosted by Eamonn Holmes.
The show was billed as a nostalgic celebration of "the best of Northern Ireland television over the past 60 years".
Speaking as he closed the simulcast programme, Mr Holmes thanked viewers for watching and said: "Here's to the next 60 years."
Dame Mary described the role of switching off the last analogue transmitter, at Divis Mountain in Belfast, as "a great privilege".
Viewers who checked Ceefax during the evening saw a special graphics countdown on page 100.
And weather presenters on the BBC during the day paid their own tribute by incorporating Ceefax's Lego block-style maps into their forecasts.
Ceefax's commitment to getting information to viewers as quickly and clearly as possible has been marked by the lifetime achievement award from the Plain English Campaign, the pressure group that calls for the use of concise and clear language in all public communication.
Founder Chrissie Maher said: "Ceefax helped everyday people with everyday words and I will be giving it a Chrissie Maher Award for its 30 years of commitment to using plain English. It was my first port of call."
She added: "It helped the public keep in touch with world affairs and everyday information with its crystal-clear communications. I will miss its clarity."
Steve Herrmann, editor of the BBC News website, said in response: "Throughout its distinguished years of service to audiences, Ceefax has always aimed to provide news which is clear, concise and simply expressed.
"It is an honour for us to receive this lifetime achievement award, and it stands as a tribute to all the journalists who have worked on the service over the years, and the care they have taken in writing every story."
Culture Minister Ed Vaizey said: "Ceefax revolutionised the way in which the public accessed information. Its peak audience of 20 million viewers is testament to the regard in which it was held - its cessation a reminder of how quickly technology is now progressing."
Harriet Harman, Labour's deputy leader and shadow culture secretary, said: "Ceefax is a great national institution, and it's sad to bid goodbye to a service which gave so many access to news, sport, TV listings and much else besides.
"But with the end of one era comes the start of another as the digital switchover is completed - people can access more channels, and interactive services which are the successors of Ceefax."