Celestial Simulator

Han-Chiang Chou

About this app

The "Astronomical Teaching System" 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.

Core Features:

• Celestial Sphere & Diurnal Motion: Observe the celestial coordinate system with options to toggle Right Ascension (RA) and Declination (Dec) grid lines. Use the slider to adjust the observer's latitude (90°N to 90°S) and instantly see how the starry sky and stellar trajectories change.


• Dual Perspectives & Relative Motion: Switch between "Earth Rotation" and "Celestial Sphere Rotation" modes to understand diurnal motion from different frames of reference. Tap on specific stars to toggle their visibility.


• Seasonal Sun Path: Explore the changes in the Sun's position along the ecliptic. Use the intuitive date slider (1/1 to 12/31) to observe the Sun's altitude and trajectory during the vernal equinox, summer solstice, autumnal equinox, and winter solstice.


• Space & Earth Modes: In "Space Mode," view Earth's orbit and axial tilt from a top-down solar system perspective. In "Earth Mode," observe the daily path of the Sun from a local observer's point of view.


• Rotation & Revolution Controls: Independently toggle Earth's rotation and revolution, with an acceleration feature to quickly demonstrate long-term astronomical changes.

This app supports intuitive pinch-to-zoom and perspective adjustments, making it a suitable learning tool for students, educators, and astronomy enthusiasts.

What’s new

V 2.2.1 Add multi-language auto-switching feature