Space Arc

About this app

SpaceArc is the most beautiful way to explore what's happening in space — tonight and beyond. We sync live data from NASA, SpaceX, NOAA Space Weather, JPL Horizons, the US Naval Observatory, ESA/Hubble, Celestrak, and more — then combine it with real-time weather from Apple Weather to tell you exactly when and where to look up. ◆ TONIGHT'S SKY See every planet visible from your exact location. Rise and set times, visual magnitude, and brightness labels — all powered by NASA's JPL Horizons and the US Naval Observatory. Know at a glance whether you need naked eyes, binoculars, or a telescope. ◆ TONIGHT SCORE A single number (0–100) that tells you how good tonight is for stargazing. We factor in cloud cover, light pollution timing, moon phase, and upcoming events to give you an instant read. ◆ NASA PICTURE OF THE DAY Start every session with NASA's stunning Astronomy Picture of the Day — complete with full descriptions, credits, and video support. Never miss a day. ◆ HUBBLE SPACE TELESCOPE Daily breathtaking imagery from the ESA/Hubble archive, with full scientific descriptions and one-tap access to the original source. ◆ LIVE SATELLITE TRACKER Track the International Space Station and hundreds of satellites in real time on a full-screen interactive map. See a visibility circle around your location showing which spacecraft are overhead right now. ◆ EVERY LAUNCH, EVERY AGENCY SpaceX missions, ULA, Arianespace, ISRO, Roscosmos — we pull from both the SpaceX API and Launch Library 2 to give you a comprehensive global launch calendar with mission details and imagery. ◆ CELESTIAL EVENTS CALENDAR Meteor showers (Perseids, Geminids, Leonids, and more), solar and lunar eclipses, planetary oppositions, supermoons, blue moons, aurora alerts — all with precise dates and rich viewing guides. ◆ AURORA ALERTS NOAA geomagnetic storm forecasts trigger automatic aurora alerts when Kp indices hit storm levels. Know when the Northern Lights might be visible from your latitude. ◆ ASTEROID WATCH Near-Earth asteroid approaches from NASA's Center for Near Earth Object Studies. See how close they'll pass and how fast they're traveling. ◆ SMART NOTIFICATIONS Tap any event to track it. SpaceArc schedules intelligent local notifications at 1 hour, 30 minutes, 10 minutes, and the moment it begins — plus weather-aware visibility checks so you know whether to step outside. ◆ CALENDAR SYNC One tap adds any event to your personal calendar with a deep link back to SpaceArc for the full viewing guide. ◆ WORKS OFFLINE Events are cached locally so the app loads instantly. SpaceArc refreshes in the background and only fetches what's changed. ◆ HOME SCREEN WIDGET See tonight's top event and viewing score right from your Home Screen without opening the app. Your next cosmic window is closer than you think. SpaceArc helps you find it.

Knowing an event is happening is only half of it. This update is about the other half: knowing where to look. WHERE DO I LOOK? Open any event and tap the new compass guide. Space Arc reads your heading live and turns the dial with you, so north stays on north and a marker rides the ring at the event's true bearing. Turn until that marker meets the index at the top of the screen and everything locks green. You're facing the right way. Now tilt up to the elevation in the middle of the dial and start watching. It knows the difference between what you're looking for: the bearing an ISS or Starlink pass climbs out of, the radiant of a meteor shower, the ecliptic where the planets sit, the polar horizon where aurora build. Each one comes with its own bearing, elevation, and a plain note on how to actually watch it. TONIGHT MISSION The home screen now opens with a single pick: the best sky moment near you tonight, scored and explained. Cloud cover and darkness both feed the Sky Score, and the read is honest. "Worth stepping outside" means go. "Conditions look rough, but the timing is on your radar" means keep your expectations low and your coat on. REMINDERS YOU CAN TRUST Setting a reminder now tells you it worked. The bell turns green while an alert is live, and you get a straight answer when one can't be set at all: the event already passed, it's too close to schedule anything useful, or notifications are switched off at the system level. No more tapping a bell and wondering. Clear skies.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Sep 16, 2026 · 12:43 PM Free