Topographic horizon of any point on Earth, for astronomy.
How access works
Anyone can use the service (page and API) up to 16 requests from their IP address, no signup.
You are using the free trial: 0/16 requests from this IP.
After the trial, choose:
Login — interactive page
9€ one-time, lifetime
Unlimited access to the page (skyplot, map, Stellarium & SVG export)
You receive an access code to paste in the access area
API key — JSON data
8€ one-time, lifetime
Access to the horizon JSON (format=json)
Up to 64 requests/day
Use it with the header X-API-Key: <key>
⚠️ Keep the code/key somewhere safe: it is the only proof of your lifetime purchase and cannot be recovered. Lose it and you must buy again. No account, no password, no reset.