# Arecibo

*Observatory*

Arecibo Observatory, Puerto Rico

| | |
| --- | --- |
| Where it is | 18.3400° N, 66.7500° W |
| State | US |
| What is done there | radio observatory |
| Dish | 305 m |
| Still working | no |

Test ranges, observatories and ground stations are a hand-picked list kept in this project rather than a published catalogue: no catalogue answers which of the world's thousands of observing sites belong on a map of it. The article below is what lets the choice be argued with.

## What it is

The Arecibo Observatory, also known as the National Astronomy and Ionosphere Center (NAIC) and formerly known as the Arecibo Ionosphere Observatory, is an observatory in Barrio Esperanza, Arecibo, Puerto Rico, owned by the US National Science Foundation (NSF).
The observatory's main instrument was the Arecibo Telescope, a 305 m (1,000 ft) spherical reflector dish built into a natural sinkhole, with a cable-mount steerable receiver and several radar transmitters for emitting signals mounted 150 m (492 ft) above the dish.

## Elsewhere

- This place on the live map: https://www.orbitalmap.space/?at=18.34,-66.75
- The article this row is vouched by: https://en.wikipedia.org/wiki/Arecibo_Observatory
- Every object: https://www.orbitalmap.space/o/
- What this site is and what it reads: https://www.orbitalmap.space/llms.txt

## Where this came from

Compiled 2026-09-17. Selected by hand for this project. Description from Wikipedia (en). Description: CC BY-SA 4.0.