Astronomy Day

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

Astronomy Day
GenreAstronomy-related events and competitions
Date(s)Saturday between mid-April and mid-May on or just before the first quarter moon
FrequencySemi-annually (Spring and Fall)
CountryUnited States
ParticipantsAstronomers and astronomy enthusiasts


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 enjoy views of the heavens. Since then the event has expanded and is now sponsored by a number of organizations associated with astronomy.[1]

Astronomy Day also forms part of National 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.

In 2018, Lebanon started celebrating the Spring Astronomy Day thanks to the Saint Joseph University Astronomy Club, with the intention of uniting astronomy enthusiasts so they can meet and share their knowledge.

Future events

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 up coming Astronomy Days:

Timeline of Astronomy Day events[2]
Year Season Astronomy Day First Quarter Moon
2019 Spring May 11 May 11
Autumn October 5 October 5
2020 Spring May 2 April 30
Autumn September 26 September 23
2021 Spring May 15 May 19
Autumn October 9 October 12
2022 Spring May 7 May 8
Autumn October 1 October 2
2023 Spring April 29 April 27
Autumn September 22 September 22
2024 Spring May 18 May 15
Autumn October 12 October 10
2025SpringMay 3May 4
Autumn September 27 September 29

Past events

Timeline of Astronomy Day events[3]
Year Season Astronomy Day First Quarter Moon
2005SpringApril 16April 16
2006SpringMay 6May 5
2007SpringApril 21April 24
2008SpringMay 10May 12
2009SpringMay 2May 1
2010SpringApril 24April 21
AutumnOctober 16October 14
2011SpringMay 7May 10
AutumnOctober 1October 3
2012SpringApril 28April 30
AutumnOctober 20October 21
2013SpringApril 20April 18
AutumnOctober 13October 11
2014SpringMay 10May 7
AutumnOctober 4October 1
2015 Spring April 25 April 25
Autumn September 19 September 21
2016 Spring May 14 May 13
Autumn October 8 October 9
2017 Spring April 29 May 2
Autumn September 30 September 27
2018 Spring April 21 April 22
Autumn October 13 October 16

See also


  1. Editors of Sky and Telescope;"Celebrate Astronomy Day". Nepe Sky And Telescope:April 28, 2012
  2. "Astronomy Day Fact Sheet | The Astronomical League". Retrieved 2016-05-09.
  3. "Astronomy Day Fact Sheet | The Astronomical League". Retrieved 2016-05-09.
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