Vor 380 wurde James Gregory geboren - Cassegrain überflügelt Gregory | deutschlandfunk.de
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File:Gregory-Teleskop.svg - Wikimedia Commons
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Gregoryteleskop – Wikipedia
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Gregorian telescope - Wikidata
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![Gregor-Teleskop : Forschern gelingt messerscharfe Nahaufnahme der Sonne - [GEO]](https://image.geo.de/30154566/t/S9/v3/w1440/r0/-/gregor-sonnenloch-nahaufnahme-jpg--88186-.jpg "Gregor-Teleskop : Forschern gelingt messerscharfe Nahaufnahme der Sonne - [GEO]")