Every Observatory on Earth

What the colours mean

Each observatory is tinted by the kind of science it does — what it points at. The great majority are astronomical, charge-blue, watching the visible night sky. The rest are the special ones, and the map is built so they stand out: a cluster always takes the colour of the rarest observatory inside it, so even a dense bloom of telescopes will glow with the one unusual instrument hiding among them.

How these instruments actually see — why a radio dish is a telescope, how you watch a particle that barely touches matter, and why some of these never look up at all — is worth a couple of minutes:

Observatories by country

Where the world watches the sky — led by the great research nations and the clear, high, dark sites they reach for. Open a country for the mix of what it watches and its earliest observatories.

About this data

Observatories, their locations and their kind come from Wikidata, the open, CC0 knowledge base. We map every site Wikidata classes as an observatory that has real coordinates, and colour it by the most specific type recorded — astronomical, solar, radio, particle, geomagnetic, nature, or volcano. Founding years, where recorded, appear in each marker’s popup, but only about one site in six carries one, so we colour by what each observatory watches rather than whenit was built — the field with the fuller, cleaner coverage. A handful of sites in Antarctica and on the open ocean appear on the map but have no country page. This is a map of where humanity watches the universe and the planet from, not a ranking. As community-maintained data it is broad but imperfect; we refresh the snapshot periodically rather than calling Wikidata on every visit.