Information about Leiden Observatory
www.strw.leidenuniv.nl

The City of Leiden
www.hollandrijnland.nl

Hooglandse Kerk
www.hooglandsekerk.com

The Boerhaave Museum
www.museumboerhaave.nl

400 Years Invention of the Telescope
www.inventionofthetelescope.eu

400 Years of the Telescope, a journey of science, technology and thought
www.fourhundredyears.com

The International Year of Astronomy 2009
www.astronomy2009.org

Special Colloquium on the History of Astronomy "400 years of telescopes - the European contribution" in the framework of the Joint European Astronomy Meeting and National Astronomy Meeting:
www.univie.ac.at/jenam2008/colloquium