# Celestial Simulator

> Interactive 3D astronomy simulator for diurnal motion and seasonal sun paths.

Canonical page: [https://chrome-stats.com/d/org.mynotes.celestial\_sphere](https://chrome-stats.com/d/org.mynotes.celestial_sphere)

## Overview

- **ID:** `org.mynotes.celestial_sphere`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Han-Chiang Chou
- **Category:** EDUCATION
- **Downloads:** 217
- **Version:** 3.1.1
- **Last updated:** 2026-03-25
- **First published:** 2026-03-12
- **Publisher country:** TW
- **Size:** 19 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=org.mynotes.celestial_sphere)
- **Privacy policy:** [https://mynotes.org/CelestialSphere/policy.html](https://mynotes.org/CelestialSphere/policy.html)

## Description

<p>The &quot;Astronomical Teaching System&quot; is an interactive application designed for learning and exploring fundamental astronomy. Through visual simulations, it helps users intuitively understand complex celestial geometry and the laws of planetary motion.</p><br><br><br><b>Core Features:</b><br><ul><br>  <li><b>Celestial Sphere &amp; Diurnal Motion:</b> Observe the celestial coordinate system with options to toggle Right Ascension (RA) and Declination (Dec) grid lines. Use the slider to adjust the observer&#39;s latitude (90°N to 90°S) and instantly see how the starry sky and stellar trajectories change.</li><br>  <li><b>Dual Perspectives &amp; Relative Motion:</b> Switch between &quot;Earth Rotation&quot; and &quot;Celestial Sphere Rotation&quot; modes to understand diurnal motion from different frames of reference. Tap on specific stars to toggle their visibility.</li><br>  <li><b>Seasonal Sun Path:</b> Explore the changes in the Sun&#39;s position along the ecliptic. Use the intuitive date slider (1/1 to 12/31) to observe the Sun&#39;s altitude and trajectory during the vernal equinox, summer solstice, autumnal equinox, and winter solstice.</li><br>  <li><b>Space &amp; Earth Modes:</b> In &quot;Space Mode,&quot; view Earth&#39;s orbit and axial tilt from a top-down solar system perspective. In &quot;Earth Mode,&quot; observe the daily path of the Sun from a local observer&#39;s point of view.</li><br>  <li><b>Rotation &amp; Revolution Controls:</b> Independently toggle Earth&#39;s rotation and revolution, with an acceleration feature to quickly demonstrate long-term astronomical changes.</li><br></ul><br><br><br><p>This app supports intuitive pinch-to-zoom and perspective adjustments, making it a suitable learning tool for students, educators, and astronomy enthusiasts.</p>

## Rankings

- #1,673,652 — Overall

## Permissions and access

### Permissions

- `com.android.vending.CHECK_LICENSE`
- `org.mynotes.celestial_sphere.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

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Source: [Chrome-Stats](https://chrome-stats.com/d/org.mynotes.celestial_sphere)