I’ve wanted this for years. Then Fable 5 dropped — and in 48 hours I crammed the entire solar system into a web page. - DEV Community

Add reaction

Like

Unicorn

Exploding Head

Raised Hands

Fire

Jump to Comments

Save

Boost

More...

Copy link<br>Copy link

Copied to Clipboard

Share to X

Share to LinkedIn

Share to Facebook

Share to Mastodon

Share Post via...

Report Abuse

Have you ever had this feeling?

We grow up knowing the solar system by heart. Mercury, Venus, Earth, Mars — most kids can rattle them off before they learn fractions. We’ve seen the posters, the documentaries, the textbook diagrams. It is, hands down, the part of the universe we know best.

But then go try to actually experience it.

Try to find one place where you can fly through the real solar system at real scale, land on a real moon, look up at a planet hanging overhead, and feel like you’re actually there.

You won’t find it.

It’s either a static image, a pre-rendered animation, or a game that squishes the planets so close together they might as well be billiard balls on a table. We know the names of our cosmic backyard. We’ve never been allowed to walk around inside it.

I’ve wanted to fix that for a long time.

The solar system is the perfect doorway to the universe. It’s close enough to be real, documented enough to be accurate, beautiful enough to be unforgettable. If you can show someone the full scale of our own neighborhood, the rest of the cosmos stops feeling abstract.

I just needed the right tool. On June 9, it arrived.

The moment Fable 5 launched, I knew the clock was running

If you were following AI that week, you felt it. Claude Fable 5 — the strongest model Anthropic had ever released publicly — wasn’t just incrementally better. It was the kind of leap that made you reorder your todo list.

My first thought wasn’t “let me test some prompts.”

It was: can this thing finally build the solar system I’ve been carrying around in my head?

Real scale. Real ephemeris. Real physics. Seamless landing. Runs in a browser. Works on a phone.

Any one of those is a serious problem. Together, they’re the kind of project that normally eats months. But Fable 5 had a quality I hadn’t seen before: it could hold an entire complex system in context and reason about it as one piece.

I didn’t hesitate. I bought the subscription that night, opened a new repo, and started. And then, for two days straight, I basically didn’t sleep.

Two days. Really, just two days.

Between June 9 and June 11, I built the skeleton: ephemeris layer, camera system, renderer, planets and moons, the seamless orbit-to-surface transition. On June 11 I committed roughly twelve thousand lines in one drop.

How do you do that in two days?

Because the hardest part of a real-scale solar system isn’t the graphics. It’s precision. A planet’s radius is thousands of kilometers. The Oort Cloud sits at 100,000 AU. Standard GPU floats can’t hold both in the same scene — if you try, the ground shudders and tears under your feet as you land.

The fix is Float64 computation, a floating origin, and a logarithmic depth buffer. Those three things have to be right from the start. If the foundation is wrong, every fix afterward is a band-aid.

Fable 5 got the foundation right on the first try. Not by writing code fast, but by understanding the architecture. It didn’t feel like pair programming. It felt like finally explaining your idea to someone who actually gets it.

Open it. Then you’ll understand why I’m excited.

https://sw.icodestar.net

No download. No account. Free. Works on your phone, your laptop, your tablet.

What it looks like when you open the link on a phone. No splash screen, no login wall — just Earth, rotating, waiting.

Put two fingers on the screen and pinch.

You fall from Earth orbit, through the atmosphere, watch the sky fade from black to blue to sunset orange, and settle onto the ocean. One continuous shot. No “enter planet” button. No loading screen.

That smoothness can’t be described. You have to feel it. The first time you pinch through the atmosphere and realize there’s no seam anywhere, something clicks.

It’s not painted. It’s computed.

Most “solar system” demos are art projects. Planet sizes are fudged. Positions are hand-placed. Orbits are looped animations.

This one is built from NASA JPL ephemerides. Every planet is where it actually is right now.

The Earth you see — clouds, continents, the lit hemisphere — matches the real sky at this moment.

Against JPL Horizons, planets are within 0.074° , the Moon within ~0.12° , and 21 fitted moons stay within 0.22° ten days out. You can run npm run verify and it will query NASA’s own API to check. For astronomy people, that matters more than any fancy shader.

And when you fly close, the detail holds up:

Jupiter’s belts and zones don’t collapse into a blur when you zoom in.

Mars is dry, rusty, cratered — instantly recognizable.

Saturn’s rings have structure, gaps, and cast real shadows...