Space Arc
Celestial Event Tracker
About
Explore celestial events with real-time data from NASA and other space agencies. Track satellites, view stunning astronomy pictures, and get personalized alerts for meteor showers, eclipses, and aurora.
What's New in Space Arc
1.5.0
October 23, 2026
The biggest Space Arc update yet — built to get you outside at the right moment and pointed in the right direction. NEW • Tonight's Plan — a timeline for tonight: sunset, full darkness, moonrise, each planet at its best, and every event you can actually see from where you are. • AR Sky Finder — hold up your phone and follow the arrow to a planet, the Moon, a meteor shower's radiant or a satellite. • Live satellite tracking — follow the ISS in real time with a countdown to its next visible pass. Space Arc now spots "Starlink trains", the spectacular lines of satellites visible for a few days after a launch. • Clear-sky alerts — one optional heads-up before sunset, only when something special is up and the forecast is clear. • Observing log — tap "I saw it" to record sightings with notes and photos, earn badges and keep a weekly streak. • Share cards — share a beautiful card of what you're watching or what you saw. • A new welcome tour that explains permissions before asking. SMARTER EVENTS • Meteor showers now show the best hours of the peak night for your location, with expected rates that account for the radiant's height, twilight and moonlight. The Quadrantids are included. • Full Moons, supermoons, blue moons, dark-sky nights, planet oppositions and Mercury/Venus elongations are calculated on your phone for your exact location and time zone. • Eclipses show whether — and how much — you'll see from where you are, through 2030. • Aurora alerts only appear when the storm happens during your dark hours and is strong enough to reach your latitude. • The Sky Score now uses the clearest dark hour of each event's viewing window. • Reminders follow rescheduled launches automatically. FIXES • Astronomy Picture of the Day shows the real daily picture again after NASA moved the service to science.nasa.gov. • Satellite passes and conditions now always use your actual location. • Corrected event dates and times, including planet oppositions and meteor-shower peaks. • Many reliability, accuracy and performance improvements. Clear skies!
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FAQ
What celestial events can Space Arc track?
Space Arc tracks a wide range of celestial events including meteor showers, solar and lunar eclipses, planetary oppositions, supermoons, blue moons, and aurora alerts. It provides precise dates and rich viewing guides for each.
How does Space Arc provide viewing information?
Space Arc syncs live data from NASA, SpaceX, NOAA Space Weather, and other agencies, combining it with real-time weather from Apple Weather. This allows it to provide rise and set times, visual magnitude, and brightness labels for visible planets.
Does Space Arc offer offline access?
Yes, Space Arc works offline by caching events locally, ensuring the app loads instantly. It refreshes in the background and only fetches changed data.
How does Space Arc notify users about events?
Space Arc provides smart notifications for tracked events, scheduling alerts at 1 hour, 30 minutes, 10 minutes, and the moment an event begins. It also includes weather-aware visibility checks.
What is the 'Tonight Score' in Space Arc?
The 'Tonight Score' is a number from 0-100 that indicates how good the current night is for stargazing. It factors in cloud cover, light pollution timing, moon phase, and upcoming events.
Does Space Arc have ads?
Yes, Space Arc contains advertisements. As it is free to download and use, ads are displayed to support the app's development and data access.
What devices is Space Arc available on?
Based on the provided data, Space Arc is currently supported on iPhone devices.
How often is Space Arc updated?
The latest version of Space Arc is 1.0.3, and it was last updated on April 13, 2026. This indicates a relatively frequent update schedule.
