# Remotion Animation Prompt: Solar System Orbital Motion

## Prompt

Build me a solar system planet orbital animation video using Remotion with the following requirements:

### Basic Parameters
- Resolution 1920x1080, 30fps, 30 seconds total duration
- Simulate one full year of planetary motion in 30 seconds (starting from 2025-01-01)
- Output format: MP4

### Scene Content
- **Dark space background** (near-black #08090d) with 500 randomly scattered stars. Star positions must be deterministic across frames (use seeded pseudo-random like `Math.sin(i * 127.1 + 42)`, NOT `Math.random()`)
- **Sun at center** with radial gradient (bright white core → golden yellow → orange), surrounded by a large semi-transparent glow halo
- **8 planets** (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune) orbiting the Sun in circular motion
- Each planet has its own color, size, and orbital period based on real astronomical data (J2000 epoch mean longitude)
- Orbit paths shown as very faint white circles (rgba 255,255,255, 0.08)

### Visual Details
- Each planet is a **radial gradient circle** (highlight offset upper-left, shadow lower-right), not a flat color circle
- Each planet has a **same-color semi-transparent glow halo** around it for presence
- **Saturn has rings** — rendered as a tilted ellipse stroke
- **Earth has a moon** — small white dot orbiting Earth with a 27.32-day period
- Each planet has a **name label** displayed above it (e.g. "Mercury", "Earth")

### Orbit Scaling Logic
- Inner planets (Mercury to Mars) use linear scaling, outer planets use **logarithmic compression**
- This ensures inner planets are clearly visible while outer planets stay within frame
- Formula: when au ≤ 1.6, radius = (40 + au × 70) × zoom; when au > 1.6, use log2 compression: radius = (40 + 1.6 × 70 + log2(au / 1.6) × 58) × zoom

### Animation & Overlays
- **No fade-in** — the very first frame should show the complete scene immediately, no gradual opacity transition
- **Title always visible**: Display "Solar System Orbital Motion" and a subtitle at the top center of the screen. The title must remain visible for the entire duration of the video, no fade-out, no entrance animation
- **Date display at bottom**: Show the current simulated date in real-time (e.g. "March 15, 2025"), displayed in a rounded pill with semi-transparent frosted-glass background, golden yellow text

### Technical Implementation Notes
- Use **Canvas 2D** to draw the sun, planets, stars, and orbit lines (not DOM elements). Redraw every frame inside a `useEffect` keyed on the frame number
- Title and date overlays use **HTML absolutely positioned on top of the Canvas** (for crisper text rendering)
- Use `useCurrentFrame()` + `interpolate()` to map frame number to day offset
- Font: system sans-serif or any clean sans-serif font

### Additional Requirements
- Register a second Composition called "InnerPlanets" with zoom set to 2.5, showing only 3 months of motion, for a close-up view of the inner planets
- Keep the project structure clean: planet data, math utilities, drawing functions, and overlay components should each be in separate files

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## Expected Result

When scrubbing the timeline, you should see:
1. Mercury zipping around the Sun multiple times
2. Earth completing exactly one full orbit (one year)
3. Jupiter and Saturn barely moving (their orbital periods are measured in years/decades)
4. The Moon rapidly circling Earth
5. The title staying visible at the top throughout the entire video
6. The date at the bottom progressing from January 1 to December 31

The rendered MP4 can be used directly for science explainer videos, social media content, or as a background for digital avatar courses.