Celestia

Lightweight Skybox Shader
A minimal, high-performance skybox shader focused purely on atmospheric beauty with almost zero performance cost.
Summary
Ultra-lightweight skybox shader that replaces the vanilla Minecraft sky with a clean, cinematic night sky featuring dense stars, soft nebulae/aurora streaks, and subtle volumetric light rays. Designed for maximum FPS (especially on low-end and mobile devices) while still delivering a premium atmospheric look.
Description
This is a pure skybox-focused shader — no complex lighting, shadows, or water effects. It only touches the sky, making it one of the lightest visual upgrades available.
Features:
Dense, sharp starfield
Soft multi-colored aurora / nebula streaks (greens, purples, and blues)
Subtle volumetric light rays and glow around bright celestial points
Clean night-time atmosphere with smooth color gradients
Extremely low overhead — ideal for low-end PCs, integrated graphics, and mobile
Perfect if you want a beautiful night sky without sacrificing performance. Just drop it in and enjoy the view.