The SolarSystem.city Sun Card on a wooden table: a wallet-sized card printed with a large orange sun, a green-and-blue Earth panel, and the planets in miniature against a black field.

The Sun Card

One wallet card. Every city. Forever.

$30 for free shipping — add NYC · World Trade Center and you're there.

What it does

It sets the scale. Point your phone at the card and the app knows exactly how big it is — that's what lets it draw a planet at true size on the pavement in front of you.
No app to install. Scan the code, and the walk opens in your browser.
One card, every city, forever. It carries no city and no planet — which one you see is worked out from where you're standing.

About this card

The Sun Card is the one physical thing the walk needs. Its border is the AR target: point a phone at it and the app knows exactly how big the card is, which is what lets it draw a planet at true scale on the pavement in front of you.

It carries no city, no coordinates and no planet. Which planet you see is worked out from where you are standing and how far through a walk you are, so the same card works on every walk we publish, in every city, indefinitely.

The Sun Card resting on the World Trade Center mission postcard, showing the size of each. — The card, with the WTC mission postcard.

Also Mission postcards A 5×7 keepsake commissioned from an artist for one particular walk →

Every piece of artwork we sell is commissioned from a person and paid for. Read our policy on generative AI, or work with us.