One Light Day vs Quorvin

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.

Quorvin helps you practise for your science exams and know exactly where you stand. Built for IGCSE, AS and A-Level students following the Edexcel and Cambridge (CAIE) science courses, Quorvin gives you real exam-style practice in Physics, Chemistry and Biology — and marks your work instantly so you always know what to improve. What you get - Topic quizzes across every major subject and level - Full timed exam papers with real marks and durations - Written-answer exams that are marked with detailed, examiner-style feedback - Instant scores, grades and progress history so you can see yourself improve - Original questions written to match the style and standard of the real exams Why students use Quorvin - Practise the way the real exam works — timed, marked, and graded - Understand your mistakes with clear feedback on every question - Track your progress across topics and papers over time Quorvin is an independent study app and is not affiliated with, endorsed by, or connected to Pearson Edexcel or Cambridge Assessment. "Edexcel", "Cambridge" and "CAIE" are used only to describe the exams this app helps you prepare for.