NASA's Iconic Countdown Clock Ticks Down Days to Replacement

NASA’s Kennedy Space Center Countdown Clock
The countdown clock at NASA’s Kennedy Space Center press site in Florida is seen ticking down to a space shuttle launch in 2011. The Apollo-era digital clock will soon be retired and replaced. (Image credit: NASA)

The countdown is now underway for the removal and replacement of the historic launch countdown clock at NASA's Kennedy Space Center in Florida.

The large digital countdown clock, which has stood for more than four decades outside the center's press site, ticking down the hours, minutes and seconds remaining to the next launch, is being replaced with a more capable, modern display like the screens used in ballparks or in New York City's Times Square.

"We are looking at [installing] a bigger screen that will look more modern," said Lisa Malone, director of public affairs at Kennedy Space Center. "It will be more flexible, so we'll be able to show the countdown, as well as have additional room to show NASA TV programming, too."

The original clock used 40-watt light bulbs to form digits and either a plus or minus sign to count down or up from the time of a launch. Painted black with blue trim, the 26-foot-long (8 meters) clock stands 10 feet (3 m) at its tallest point.

The decision now to replace the countdown clock was not driven by aesthetics or capability alone, Malone explained. Though iconic — over the years, the clock was frequently seen in the foreground of rocket and space shuttle launch photographs and footage — it was increasingly difficult to maintain.

"The clock is made of parts that are no longer being made and so it is harder and harder to keep it running," Malone told collectSPACE.

Though some NASA's records indicate the clock may date back to 1967, archival photos show it was absent from its location at the northeast corner of the press site until the launch of Apollo 12, the second moon landing mission, in November 1969. It was then in use for the remaining six Saturn V launches, four Saturn IB rocket launches and all 135 space shuttle missions through 2011.

In more recent years, the clock was also used to display the time leading up and through numerous planetary probe and uncrewed NASA launches. Most recently, it was used for the Sept. 25 liftoff of a commercial resupply mission to the International Space Station.

By the time of NASA's next launch from Florida however, the historic clock may already be replaced. The agency is targeting Dec. 4 for Exploration Flight Test-1 (EFT-1), the first test flight of its next generation crew capsule, Orion.

"Our goal is to have it in place by EFT-1," Malone said. "I am really hopeful that we are going to be able to get the new clock in place by then."

"I think it is going to be a really tight timeline to make that happen and get it hooked up and ready to go," she added.

The black with blue trim, 26-foot-long countdown clock at NASA’s Kennedy Space Center press site in Florida displayed the hours, minutes and seconds to a launch using lightbulbs to form digits. (Image credit: NASA)

Still, Malone noted, they don't want to rush the removal of the original clock given its status on the National Register of Historic Places. NASA has completed documenting and photographing it for posterity, but care will still be taken to make sure it is not damaged.

"Because it is a historic piece, we want to make sure it is removed intact," she said.

The curators at the Smithsonian in Washington, D.C. have expressed their interest in the original clock, Malone said, but NASA's plan as of now is to transfer it to the Kennedy Space Center Visitor Complex. There, it will eventually be placed on public display.

Click through to to see NASA’s countdown clock in use during its first launch, Apollo 12 in 1969.

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Robert Z. Pearlman Editor, Contributor

Robert Pearlman is a space historian, journalist and the founder and editor of, an online publication and community devoted to space history with a particular focus on how and where space exploration intersects with pop culture. Pearlman is also a contributing writer for and co-author of "Space Stations: The Art, Science, and Reality of Working in Space” published by Smithsonian Books in 2018. He previously developed online content for the National Space Society and Apollo 11 moonwalker Buzz Aldrin, helped establish the space tourism company Space Adventures and currently serves on the History Committee of the American Astronautical Society, the advisory committee for The Mars Generation and leadership board of For All Moonkind. In 2009, he was inducted into the U.S. Space Camp Hall of Fame in Huntsville, Alabama. In 2021, he was honored by the American Astronautical Society with the Ordway Award for Sustained Excellence in Spaceflight History.