Free Android app streaming 12 NASA SDO solar wavelengths, real-time space weather via NASA DONKI, and offline moon phases for 200+ cities.
Key Takeaways
Solar imagery pulled directly from NASA SDO every ~15 minutes across 12 wavelengths, spanning the 5,000 K photosphere to 10-million-degree flare plasma.
Moon phase engine uses Jean Meeus’s Astronomical Algorithms fully offline, accurate to minutes for phase, illumination, rise/set, and Earth-Moon distance.
Space weather tracks solar flares (B/C/M/X scale), CMEs up to 3,000 km/s, and geomagnetic storms (G1-G5) pulled from NASA DONKI in real time.
Location data never leaves the device: city chosen from a list, stored locally only, no GPS, no accounts, no ads.
Solo build by one indie developer (U.S. Army veteran); Android live, iOS universal build submitted to Apple Review on 2026-04-27.
Hacker News Comment Review
The App Store button currently redirects to the GitHub legal page rather than a live store listing, meaning iOS is not yet publicly available despite the submitted build.
