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Arecibo 305-m telescope

With its diameter of 305 m the Arecibo 305-m telescope was for a long time the largest single radio telescope in the world.

Aerial view of the Arecibo 305-m telescope. Photo courtesy National Astronomy and Ionosphere Center.

Built into a valley and using a moveable focus assembly, the Arecibo dish is used as a meridian instrument, i.e., it observes sources passing above it within a certain declination and hour angle range. It can track objects for up to 2 hours at a time.