ASGuide vs Space Arc

Discover the wonders visible in your sky tonight. ASGuide (Astronomy Sky Guide) turns your location and observing time into a personal guide to the night sky. Discover visible planets, galaxies, nebulae, stars, star clusters, and galactic regions. Plan an observation, explore from home, or find your next celestial target. Find objects worth viewing and learn more about every discovery: - See what is visible from your location and when to observe it. View rise, transit, and set times. - Filter by magnitude, altitude above the horizon, constellation, object type, and more. - Search by common name, catalog number, constellation, object type, or detailed classification. - Browse the solar system and deep-sky categories. - Return quickly to recent searches and recently viewed objects. - See which planets are visible. - Save favorite objects for future viewing. - Use your current location or select any location on Earth. - Check sunrise, sunset, twilight, and night times. - Follow the current moon phase, illumination, moonrise, moonset, and the next new and full moons. - Open high-resolution imagery and explore objects with the interactive sky atlas. Customize the Home screen with the information that matters to you. Use the dark appearance for nighttime observations, or the standard iOS appearance. Your next night-sky discovery starts with ASGuide.

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.