# Astrarium — Offline planetarium, sky atlas

> Offline planetarium, sky atlas (iPhone/iPad app by Shinsuke Abe.)

- Source: https://appshunter.io/ios/app/astrarium/id6795053748 (this page in markdown: same URL + `.md`)
- Developer: [Shinsuke Abe](https://appshunter.io/developer/6790818921)
- Category: Education, Entertainment
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 69 MB
- Languages: American English, Japanese
- Released: 2026-07-27
- Data updated: 2026-08-14
- User reviews in markdown: https://appshunter.io/ios/app/astrarium/id6795053748/reviews.md

## What is Astrarium?

Choose a place and a time, and Astrarium draws that sky. Every position is computed on the device, so the whole app works where there is no signal.

CATALOGUES (all bundled)
• 9,096 stars — Yale Bright Star Catalogue, to about magnitude 8: everything the naked eye can see
• 155 nebulae, clusters and galaxies — the Messier and Caldwell objects, with photographs and descriptions
• The 88 IAU constellations: 672 line segments and the classical figures
• The Milky Way, built from the integrated light of the Tycho-2 stars
• Planets and the Moon from JPL DE421, with surface maps, libration, lunar age and the traditional full-moon names
• 16 major meteor showers, the MPC observatory codes, observing sites worldwide

WHAT IT DOES
• Whole-sky and horizon views, pinch zoom down to a one-arcminute field
• Jump to any date, run the clock at up to 6000x, step by the synodic month
• Planet close-ups: apparent diameter, phase, geocentric and heliocentric distance, orbital elements, and the moons of Jupiter, Saturn and Mars — tap one for its own figures
• Meteor shower calendar: maximum in local time and UT, radiant altitude, moon conditions, and an expected hourly rate from the ZHR and the radiant altitude
• Satellites: fetch CelesTrak elements and watch the ISS or Tiangong cross the chart, with visible-pass predictions
• Comets and asteroids from the MPC and JPL, plotted on the chart
• Four coordinate grids, the ecliptic, celestial equator, galactic plane and meridian, and field-of-view frames for smart telescopes and camera lenses
• Switch each layer on its own: constellation lines and names, stars, star names, the Sun and planets, deep-sky objects, the Milky Way and the constellation figures — turn the stars off and the figures stand alone
• Limiting magnitude that follows twilight and moonlight, a red night-vision mode, PNG/PDF export, a captioned demo, screen recording, and spoken summaries

LOCATION
Your position is used only to compute the sky where you are, and never leaves the device. If you decline, pick a site from the list or type in the coordinates: nothing is lost.

No ads, no in-app purchases, no account. Every source and licence is listed in the app under Credits.


## Version history (last 2 releases)

### 1.1 — 2026-08-06

• Your observing site, language and display switches are remembered, so the app opens where you left it — including coordinates you typed in by hand.
• Satellite element sets and comet/asteroid elements are now kept after you fetch them, so they are there offline next time.
• Added the galactic plane to the coordinate lines.
• Added "Long exposure": trails are no longer faded away, so diurnal motion builds up as it would on film.
• Star proper names are shown in katakana when the app is in Japanese.
• Tidied the line colours: the equatorial grid and celestial equator in red, the galactic grid and galactic plane in yellow-green, the meridian a thin grey dashed line.
• Sunlight and moonlight are now separate switches.
• "Planets" is now "Sun, Moon & planets", and the stars have a switch of their own.
• The View tab is reordered: objects, constellations, the sky itself, coordinate lines, then viewing aids.
• The site category "Overseas observatories" is now "World observatories".
• Constellation art is fetched in one go and appears at once; the seams between figures are filled, and in horizon view it is cut at the zenith.
• Zooming to a planet now draws it at its true size straight away, without waiting for the surface map.
• The demo tour gains three scenes: dozens of Starlink crossing a twilight sky, a long exposure, and the Messier objects M3, M13, M16 and M20 with their photographs and notes.
• While the tour runs, the button turns into a red "Stop demo" so you can leave it at any point.
• Fixed the horizon drifting off centre after zooming in on an object and back out in all-sky view.
• Fixed the blurred edge on the time-step buttons.
• A Mac edition is now available.

### 1.0 — 2026-07-27

No release notes.

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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 2026-08-14.*