ESO's Extremely Large Telescope is now half completed

The European Southern Observatory's Extremely Large Telescope (ESO's ELT) is a revolutionary ground-based telescope that will have a 39-meter main mirror and will be the largest telescope in the world for visible and infrared ...

Managing precision and stabilizing local knowledge

In 1911, a meridian circle manufactured by A. Repsold & Söhne in Hamburg, Germany, was installed at the National Astronomical Observatory of Chile under the watch of Friedrich W. Ristenpart, a German astronomer and the observatory's ...

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