# Moon phases assist — Moon, Earth and Sun

> Interactive educational app for learning moon phases and celestial mechanics. (iPhone/iPad app by Plus Inc. (Japan).)

- Source: https://appshunter.io/ios/app/moon-phases-assist/id1070111214 (this page in markdown: same URL + `.md`)
- Developer: [Plus Inc. (Japan)](https://appshunter.io/developer/445792061)
- Category: Education, Reference
- Price: Free
- Rating: 3.50/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 64 MB
- Languages: American English, Japanese
- Released: 2016-01-05
- Data updated: 2026-08-30
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/moon-phases-assist/id1070111214/reviews.md

## What is Moon phases assist?

This app allows you to visually learn about the different phases of the moon depending on the positions of the moon, the Earth, and the Sun.

The app has undergone a major overhaul to improve its features!

Why does the moon have different phases?
Why does the height of the Sun change depending on the season?
These diagrams provide easy answers to these questions!

You can intuitively grasp the positions of the Sun, the Earth, and the moon through overhead and celestial sphere diagrams!

What are the positions of the Sun and the moon during a full moon?
Where is the Sun when the waning crescent transits the meridian?

You can answer these questions by turning the dial and checking their positions!


※The size and distance of celestial objects are not drawn to scale but exaggerated for easier understanding.
※For easier understanding, the Earth's orbit is made circular instead of elliptic while the inclination of the moon's orbit has been omitted.

## Key features

- Visual moon phase learning
- Celestial body position diagrams
- Interactive dial for position checking
- Answers to astronomy questions
- Overhead and celestial sphere views
- Improved features through overhaul

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/moon-phases-assist/id1070111214/reviews.md

### 4/5 — Excellent visual representation of moon-sun relationship

*2019-11-16*

I agree with other viewers, it has room for more improvement. There is a similar app for Android users. This one lets Apple get a glimpse too, but perhaps needs to be more flexible and I would like to see the Western Hemisphere in the free version, please.

### 3/5 — Good start, usable, but still needs more development

*2016-07-27*

It is a good learning tool to start a lunar discussion, however, kids get pretty bored just watching the app make the orbits. To improve, they need to allow the user to select dates and/or times to predict and tie information together. Also, a zoom function would help. 
This was pretty good through the big LED projector. 
So, this is a good beginning, and I used it in my 7th grade classroom, but to be more powerful than one day...keep going this could be really good.

## Frequently asked questions about Moon phases assist

### What is Moon phases assist?

Moon phases assist is an educational application designed to help users visually understand the different phases of the moon. It uses interactive diagrams to illustrate the positions of the moon, Earth, and Sun, explaining phenomena like seasonal sun height changes.

### How does Moon phases assist teach about moon phases?

The app provides overhead and celestial sphere diagrams that allow users to intuitively grasp the positions of celestial bodies. An interactive dial lets users check these positions, answering questions about why the moon has phases or where the Sun is during specific lunar cycles.

### Is Moon phases assist suitable for children?

Yes, Moon phases assist has an age rating of 4+, making it suitable for younger learners. The app's visual approach and simplified explanations are designed for easy understanding of complex astronomical concepts.

### What devices does Moon phases assist support?

Moon phases assist is available on iPhone, iPad, and iPod. The app is designed to function across these Apple devices.

### How often is Moon phases assist updated?

The latest version of Moon phases assist is 3.4.0, last updated on February 21, 2025. This indicates a relatively recent update, suggesting ongoing development and feature improvements.

### Does Moon phases assist have ads?

Yes, Moon phases assist contains advertisements. As it is a free application, ads are used to support its development and availability.

### What is the user rating for Moon phases assist?

Moon phases assist has a rating of 3.5 stars based on 2 ratings. This feedback suggests a mixed but generally positive reception from its user base.

### Are the celestial object sizes accurate in Moon phases assist?

No, the app explicitly states that the size and distance of celestial objects are exaggerated for easier understanding. Similarly, the Earth's orbit is depicted as circular instead of elliptical for simplicity.

## Version history (last 5 releases)

### 3.4.0 — 2025-02-21

Support iOS 18.
Improved stability and performance.
Fixed some bugs.

### 3.3.0 — 2024-01-19

Support iOS 17.
Improved stability and performance.
Fixed some bugs.

### 3.2.0 — 2022-12-14

Changed to look at the moon facing north. (When the observer's position is set to the southern hemisphere.)
Added rotate sun direction by dragging. (In the second viewpoint.)
Fixed some bugs.

### 3.1.0 — 2022-12-08

Added sound effects.
Fixed some bugs.

### 3.0.0 — 2022-12-03

Changed the user interface.
Optimized resources.
Optimized processing.
Fixed some bugs.

## Apps similar to Moon phases assist

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| --- | --- | --- | --- |
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## More apps by Plus Inc. (Japan)

- [mew mew Train](https://appshunter.io/ios/app/mew-mew-train/id445792058)
- [Magical Rays](https://appshunter.io/ios/app/magical-rays/id445795692)
- [Magical Shot](https://appshunter.io/ios/app/magical-shot/id483079193)
- [Your Books Happy Birthday](https://appshunter.io/ios/app/your-books-happy-birthday/id496493406)
- [Your Books How Many](https://appshunter.io/ios/app/your-books-how-many/id505425039)
- [Enjoy Learning Japan Puzzle](https://appshunter.io/ios/app/enjoy-learning-japan-puzzle/id520743227)

All apps by Plus Inc. (Japan): https://appshunter.io/developer/445792061

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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 2026-08-30.*