Day-Night Earth - Free Online | FunToolX
Use Day-Night Earth online for free, no download required. FunToolX offers hundreds of fun online tools.
About this tool
Day-Night Earth is a free online visual effect. 3D Earth day-night terminator, city lights, sun angle and axial tilt control. Interactive eye-candy rendered live on your screen. It runs entirely in your browser — no download or sign-up needed.
After opening the page, a 3D Earth will be displayed. The Earth is rotating. The side facing the sun is daytime, and the side facing away from the sun is night. The morning and dusk line is clearly visible. Parameters such as rotation speed and sun angle can be adjusted.
The whole process is purely front-end animation, based on Three.js 'sphere geometry and shader program, which uses dot products to calculate the day-night boundary.
It is suitable for use as astronomy science, earth-themed decoration, or purely appreciating the natural beauty of day and night. The implementation principle is a sphere shader plus lighting calculation.
Day and Night Earth is a visual effect that displays the alternation of day and night due to the rotation of the earth. It is based on WebGL for real-time rendering.