International Dark Sky Week

International Dark Sky Week, also known as National Dark-Sky Week, National Dark Sky Week, and IDSW, was not observed recently. It was observed for 8 days starting on April 1st in 2003. It was observed for 8 days starting on April 19th in 2004. It was observed for 8 days on an unknown date in 2005. It was observed for 8 days starting on April 23rd in 2006. It was observed for 8 days starting on April 17th in 2007. It was observed for 7 days starting on March 29th in 2008. It was observed for 7 days starting on April 20th in 2009. It was observed for 7 days starting on April 4th in 2010. It was observed for 8 days starting on April 1st in 2011. It was observed for 7 days starting on April 14th in 2012. It was observed for 7 days starting on April 5th in 2013. It was observed for 7 days starting on April 20th in 2014. It was observed for 7 days starting on April 13th in 2015. It was observed for 7 days starting on April 4th in 2016. It was observed for 7 days starting on April 22nd in 2017. It was observed for 7 days starting on April 15th in 2018. It was observed for 8 days starting on March 31st in 2019. It was observed for 8 days starting on April 19th in 2020. It was observed for 8 days starting on April 5th in 2021. It was observed for 9 days starting on April 22nd in 2022. It is observed for 8 days starting on April 17th in 2023.

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