The Izera Dark-Sky Park (Izerski Park Ciemnego Nieba), which straddles the borders of Poland and the Czech Republic, became at its founding in 2009 the first ever transboundary dark-sky park in the world. Established along the Izera mountains, it is located about halfway between Wroclaw (Poland) and Prague (Czech Republic), approximately 75 miles (120 km) from either city. A biannual “Astronomical Day” event offering lectures, sky viewing sessions and planetarium shows is hosted every spring by the Czech Republic and in autumn by Poland.
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