The Archenhold Observatory was named in honour of Friedrich Simon Archenhold, is an observatory in Berlin-Treptow. It houses the Großer Refraktor, which is the longest pointable telescope in the world. It is also called the Himmelskanone.
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Official Website https://www.planetarium.berlin/archenhold-sternwarte
Phone +49 30 536 063 7199
Coordinates 52°29'9.003" N 13°28'34.798" E