# Space Arc — Celestial Event Tracker

> Celestial event tracker with real-time space data and personalized viewing alerts. (iPhone/iPad app by Marc L. Melcher.)

- Source: https://appshunter.io/ios/app/space-arc/id6759466047 (this page in markdown: same URL + `.md`)
- Developer: [Marc L. Melcher](https://appshunter.io/developer/371961192)
- Category: Education
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 18.6 · 7 MB
- Languages: American English
- Released: 2026-03-08
- Data updated: 2026-08-22
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/space-arc/id6759466047/reviews.md

## What is Space Arc?

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.

## Key features

- Real-time satellite tracking
- NASA Picture of the Day
- Global launch calendar
- Celestial events calendar
- Aurora alerts
- Smart notifications
- Offline event caching


## Frequently asked questions about Space Arc

### 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.

## Version history (last 3 releases)

### 1.0.3 — 2026-04-13

Tracking more satellites than ever!  Bugs squashed.

### 1.0.2 — 2026-03-12

Bug fix. Better data caching.

### 1.0 — 2026-03-08

No release notes.

## More apps by Marc L. Melcher

- [MELD Calculator](https://appshunter.io/ios/app/meld-calculator/id445754652)
- [EPTS Calculator](https://appshunter.io/ios/app/epts-calculator/id977017619)
- [Transplant Stickers](https://appshunter.io/ios/app/transplant-stickers/id1311222535)
- [SUNTRAC4TXP](https://appshunter.io/ios/app/suntrac4txp/id1473852218)
- [UK DCD Risk Calculator](https://appshunter.io/ios/app/uk-dcd-risk-calculator/id1489366373)
- [EASE Score Calculator](https://appshunter.io/ios/app/ease-score-calculator/id1546162456)

All apps by Marc L. Melcher: https://appshunter.io/developer/371961192

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*