Astronomy Day

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Astronomy Day
Status Active
Genre Astronomy-related events and competitions
Date(s) Saturday between mid-April and mid-May on or just before the first quarter moon
Frequency Bi-annually
Country United States
Participants Astronomers and astronomy enthusiasts

Astronomy Day is an annual event in the United States intended to provide a means of interaction between the general public and various astronomy enthusiasts, groups and professionals.


This event was started in 1973 by Doug Berger, the president of the Astronomical Association of Northern California. His intent was to set up various telescopes in busy urban locations so that passersby could enjoys views of the heavens. Since then the event has expanded and is now sponsored by a number of organizations associated with astronomy.

Astronomy Day also forms part of Astronomy Week, which begins on the preceding Monday.

Originally, Astronomy Day occurred on a Saturday between mid-April and mid-May, and was scheduled so as to occur at or close to the first quarter Moon. In 2007, an autumn rendition of Astronomy Day was added. It was scheduled to occur on a Saturday between mid-September and mid-October so as to be on or close to the first quarter Moon.


The lunar influence on the schedule means that the events happen on a different date each year, rather than set calendar dates. The table below shows the dates for Astronomy Day:

Timeline of Astronomy Day events
Year Season Astronomy Day First Quarter Moon
2005 Spring April 16th April 16th
2006 Spring May 6th May 5th
2007 Spring April 21st April 24th
2008 Spring May 10th May 12th
2009 Spring May 2nd May 1st
2010 Spring April 24th April 21st
Fall October 16th October 14th
2011 Spring May 7th May 10th
Fall October 1st October 3rd
2012 Spring April 28th April 30th
Fall October 20th October 21st
2013 Spring April 20th April 18th
Fall October 13th October 11th
2014 Spring May 10th May 7th
Fall October 4th October 1st
  indicates upcoming event

See also[edit]


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