Space Arc
Celestial Event Tracker
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Now tracking every major rocket launch worldwide — SpaceX, ULA, Arianespace & more. Plus live satellite maps, planet visibility, and smart weather-checked alerts!
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Tracking more satellites than ever! Bugs squashed.
The developer, Marc L. Melcher, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Marc Melcher
- Size
- 7 MB
- Category
- Education
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026