One Light Day vs Orbit

One Light Day is a free digital monument celebrating Voyager 1, humanity’s farthest spacecraft. On 18 November 2026, Voyager 1 is expected to reach a remarkable symbolic milestone: a distance from Earth that light takes approximately twenty-four hours to cross. One Light Day transforms that immense distance into a personal and interactive experience. DISCOVER THE JOURNEY Follow Voyager 1 from its 1977 launch, past Jupiter and Saturn, through the heliopause and into interstellar space. EXPERIENCE THE DISTANCE See its estimated distance from Earth, one-way light time and the countdown to the one-light-day horizon. MEET VOYAGER 1 Examine and interact with a detailed 3D model of the spacecraft that has travelled farther than any other human-made object. EXPLORE THE GOLDEN RECORD Discover the sounds, images, greetings and scientific symbols selected to represent Earth to the cosmos. FIND VOYAGER IN THE SKY Use your iPhone’s location and motion sensors to face the estimated direction of Voyager 1. SEND A SYMBOLIC LIGHT Begin with prime numbers, then encode a short human word as flashes of light. After sending it, follow a twenty-four-hour chronograph representing the photon’s journey. A FREE EXPERIENCE One Light Day contains no advertising and requires no subscription. Every experience is available to everyone. Optional contributions help maintain the app and its website but never unlock additional functionality. Voyager 1 will remain humanity’s farthest pioneer, our avant-garde in interstellar space. One Light Day is an independent educational, cultural and artistic tribute. It is not affiliated with or endorsed by NASA or JPL. Scientific distances, directions and times are estimates and are not real-time telemetry.

Orbit is a solar system explorer built on real NASA data, not just illustrations. EXPLORE Rotate detailed 3D globes of every planet, listen to real recorded sounds from NASA missions, and browse real photos pulled live from NASA's own archive. See today's Astronomy Picture of the Day and the latest real photos from the Mars rovers. GO DEEPER Browse black holes, galaxies, exoplanets, and nebulae — plus a live feed of NASA's most recent Hubble and Webb telescope images, real current space weather, and the latest from NASA's Artemis Moon missions. FIND WHAT'S REALLY ABOVE YOU Point your phone at the sky and Sky Map shows you real stars, planets, and constellations, calculated live from your actual location and the current time — not a static illustration. BUILD YOUR OWN SOLAR SYSTEM Drop in planets and stars, and watch real gravitational physics take over. Smash two suns together and watch a black hole form. PLAY Test what you've learned with a Solar System Quiz, dodge asteroids, and pilot a rocket toward space. Orbit's free tier includes full access to the Explore tab and Mars rover photos. Orbit Premium ($4.99/month) unlocks Deep Space, the Solar System Builder, and all games. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/