# Astrophysics I

> Educational app covering the solar system with detailed astrophysics explanations and 3D animations. (iPhone/iPad app by Xavier Daxhelet.)

- Source: https://appshunter.io/ios/app/astrophysics-i/id449455262 (this page in markdown: same URL + `.md`)
- Developer: [Xavier Daxhelet](https://appshunter.io/developer/339056993)
- Category: Reference, Education
- Price: $3.99
- Rating: 4.40/5 from 8 App Store ratings · 33 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.6 · 249 MB
- Languages: French (France), American English
- Released: 2011-07-27
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/astrophysics-i/id449455262/reviews.md

## What is Astrophysics I?

Astrophysics I is the first of a series of three educative applications in astronomy. This first part covers the solar system. 
More than 90 screens of astronomy on the solar system ! 
More than 40 animations to explain astrophysics, most in 3D. 

For teachers !! Connect your iPad to a video projector and show the animations to your students in classroom. 

List of topics:

Introduction:
- Reminder of mathematics,
- Reminder of mechanical,
- Coordinate Systems,
- Time measurement.

Gravity
- Gravity,
- The orbits,
- The orbit elements,
- Kepler's laws,
- The Lagrangian points.

The Solar System
- Earth,
- The Earth-Moon system,
- The Earth's atmosphere,
- Atmospheres,
- Distance Scale,
- Models of Solar Systems,
- Asteroids,
- Comets,
- The planets.

Constants
- Physical constants,
- Astronomical constants.

References
- Books,
- Websites.

## Key features

- Solar system coverage
- Astrophysics explanations
- 3D animations
- Classroom projection feature
- Detailed topic lists
- Physical and astronomical constants

## Recent user reviews (10 of 33)

All indexed reviews: https://appshunter.io/ios/app/astrophysics-i/id449455262/reviews.md

### 5/5 — Excellente application comme peu

*2026-07-11*

Indispensable

**Developer response:** Ce problème a été résolu avec la version 5.1.

### 5/5 — Bonne Astronomie

*2026-04-24*

Données intéressantes…

### 3/5 — Textes illisibles, blanc sur fond jaune

*2026-04-15*

Depuis la dernière mise à jour illisible sur l’application 1 et 2 idem.
Merci !

### 5/5 — Needs a better general information!

*2024-07-14*

This app is getting old. Could you make it better by adding more chapters and informations and animations?

### 5/5 — excellent

*2016-09-03*

excellente application que je recommande à tous.

### 1/5 — Astrophysics apps

*2016-08-27*

I am a science student at university, and I bought the set of these astrophysics apps and they do not work. I paid nearly 10 dollars for the both of them, and I can't do anything. I don't have a lot of money and I got this in return. The apps crash like crazy, particularly astrophysics II. I've never written a bad review in my life, until now. I'd love a refund for a complete waste of my money.

### 1/5 — Bug quasi total

*2016-06-06*

Bonjour, je viens d'acheter cette app qui est vraiment bonne et complète. Mais!: plantage complet! Presque toutes les animations, animations 3D et informations ne s'ouvrent pas! Dommage car elle est vraiment très bien. Je le sais parce que j'ai réussi à la voir entièrement une seule fois. Depuis plus rien! Et j'essaye plusieurs fois par jour. Veuillez donc s'il vous plaît corriger et remédier à ce gros Bug au plus vite ou alors remboursez. J'aimerais également acheter astrophysique n°2 mais j'attend la réparation de ce n°1. Merci d'avance. Cordialement.

### 1/5 — Bug sur les animations

*2016-05-17*

Impossible de joindre le concepteur  sur le bug des animations merci de rembourser l application

### 1/5 — Another waste of money

*2016-04-12, version 3.2*

While I was able to download this app, tapping on any animation/graphic link freezes the app.

### 1/5 — Will not download

*2015-12-25*

This seems like a great app. I have the second one, but this one will not download so I wasted my money on an app that will not download. Please fix this!

## Frequently asked questions about Astrophysics I

### What topics does Astrophysics I cover?

Astrophysics I covers an introduction to mathematics and mechanics, coordinate systems, time measurement, gravity, orbits, Kepler's laws, Lagrangian points, and detailed information on the solar system including Earth, the Moon, atmospheres, asteroids, comets, and planets. It also includes physical and astronomical constants.

### Is Astrophysics I suitable for classroom use?

Yes, Astrophysics I is designed for teachers. It can be connected to a video projector via an iPad to display animations and content to students in a classroom setting.

### What is the price of Astrophysics I?

Astrophysics I is a paid application priced at $3.99. This is a one-time purchase with no in-app purchases or subscriptions.

### What devices support Astrophysics I?

Astrophysics I is supported on iPhone, iPad, and iPod devices. It is designed to be compatible across these Apple mobile platforms.

### How often is Astrophysics I updated?

The latest version of Astrophysics I is 4.0, which was last updated on January 24, 2019. While not frequently updated, the content is comprehensive for its subject matter.

### What is the age rating for Astrophysics I?

Astrophysics I has an age rating of 4+. This indicates it is suitable for children aged 4 and above, making it accessible for younger learners with adult supervision.

### Does Astrophysics I have ads?

No, Astrophysics I does not contain advertisements. As a paid application, it offers an uninterrupted learning experience without any ad interruptions.

### What do users think of Astrophysics I?

Astrophysics I has received positive user feedback, holding a rating of 4.4 stars from 8 ratings. This suggests a generally satisfied user base who appreciate its educational content.

## Version history (last 5 releases)

### 5.1 — 2026-04-28

- Fixed a bug with the display in Dark mode.

### 5.0 — 2026-04-14

- fixed some bugs.
- modernized interface,
- update for iOS 26.

### 4.0 — 2019-01-24

- Update for the new iPads pro 2018
- Add an animation,
- General improvements.

### 3.7 — 2018-03-22

Bugs corrections.

### 3.6 — 2017-12-17

- Update for iOS 11.
- Ready for iPhone X.

## Apps similar to Astrophysics I

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Country Facts 2024](https://appshunter.io/ios/app/country-facts-2024/id421630769) | 5.0 (3) | $0.99 | Reference |

## More apps by Xavier Daxhelet

- [Refractive](https://appshunter.io/ios/app/refractive/id339056990)
- [Touch Waves](https://appshunter.io/ios/app/touch-waves/id347672384)
- [Heat & Work](https://appshunter.io/ios/app/heat-and-work/id377771944)
- [Mechanix](https://appshunter.io/ios/app/mechanix/id386599739)
- [Electromag](https://appshunter.io/ios/app/electromag/id404649255)
- [Touch Fluids](https://appshunter.io/ios/app/touch-fluids/id427420343)

All apps by Xavier Daxhelet: https://appshunter.io/developer/339056993

## Related topics

[astrophysics i](https://appshunter.io/ios/topics/astrophysics-i) · [astrophysics ii](https://appshunter.io/ios/topics/astrophysics-ii) · [xavier daxhelet](https://appshunter.io/ios/topics/xavier-daxhelet)

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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 2026-08-26.*