Apollo 11 Launch Replay Screensaver
The Apollo 11 Launch Replay screensaver replays the real July 16, 1969 launch countdown and early ascent on a loop, with real mission-elapsed-time markers. It is free, runs in your browser, and ESC exits.
Live preview
Press ESC to leave fullscreen. Settings are saved in your browser only.
How the Apollo 11 Launch Replay screensaver works
The saver steps through a real, curated timeline of the actual Apollo 11 countdown and launch, from T-minus 15 seconds through Trans-Lunar Injection.
A live mission clock counts through real T-minus and T-plus times, synced to each real historical milestone.
Real, well-documented callouts from the actual mission — "liftoff", "tower clear", "Go for TLI" — appear at their real moments.
Once the replay reaches the end of the real sequence, it loops back to the start of the countdown.
The mechanics of a Saturn V launch
Apollo 11 left Kennedy Space Center on a Saturn V, the three-stage rocket NASA built to send astronauts to the Moon. Launch countdown times are written relative to liftoff: T-minus counts down to zero, and T-plus counts up from it.
The first stage, the S-IC, burned for roughly 150 seconds using RP-1 kerosene and liquid oxygen in five F-1 engines. The second stage, the S-II, burned liquid hydrogen and liquid oxygen in five J-2 engines. The third stage, the S-IVB, had a single J-2 and fired twice: first to reach a low parking orbit around the Earth, and again after systems checks to send the spacecraft toward the Moon in the burn called trans-lunar injection.
Voice calls in launch audio are short and standardised, because many people must act on the same information. When Apollo 11 cleared the launch tower, engineers in the Firing Room at Kennedy handed control of the flight to the Mission Control Center at the Manned Spacecraft Center in Houston. A replay of the sequence is a reconstruction of key moments, not a recording of the whole event.
A worked example
The clock ticks down through the real final ten seconds before igniting into "liftoff, we have a liftoff" at the exact real historical moment it happened.
Settings & tips
- Accent recolours the mission clock.
- Every event and timestamp is real, drawn from the actual mission record.
- The full real countdown-through-TLI sequence loops continuously.
Frequently asked questions
- Is this real historical footage?
- No — it is a real, text-based timeline recreation of the actual mission events and timestamps, not video.
- Are the callouts real?
- Yes — drawn from real, well-documented Apollo 11 mission history.
- Is a key needed?
- No — it is a pure local, curated timeline.
- Is it free?
- Yes — free, no download, in your browser.
- What does trans-lunar injection mean?
- It is the engine burn, made by the third stage after the spacecraft was in Earth orbit, that raised its speed enough to leave orbit and follow a path to the Moon.
- Why does control hand over to Houston after liftoff?
- Launch teams at Kennedy ran the countdown, and once the vehicle cleared the tower, flight control passed to the flight controllers at the Manned Spacecraft Center in Houston.
- Why are there separate stages?
- Dropping empty tanks and engines lets the remaining vehicle accelerate more efficiently. Each stage is discarded after it has used its propellant.