Help us celebrate International Dark Sky Week and achieve our vision by spreading the word on social media.

The Basics

Primary Hashtags: #IDSW2020 #DarkSkyWeek #lookuptogether
Secondary Hashtags: #idadarksky #darksky #lightpollution

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What is International Dark Sky Week?

International Dark Sky Week is a worldwide event hosted by the International Dark-Sky Association to celebrate the night and bring attention to the problems caused by light pollution. Each year, International Dark Sky Week is held in April during the week of the new Moon, when the sky is darkest and the stars most visible. This year’s celebrations begin on Sunday, April 19th and runs through Sunday, April 26th, 2020.

What is the International Dark-Sky Association (IDA)?

IDA works to protect the night from light pollution. Since1988, the International Dark-Sky Association has promoted win-win solutions that allow people to appreciate dark, star-filled skies while enjoying the benefits of responsible outdoor lighting. IDA is headquartered in Tucson, Arizona. Learn more at