Carl Sagan Day
Carl Sagan Day on 9 November marks the birthday of the US astronomer and science communicator with stargazing, talks and science events.
- UK (not marked)
- USA
- Ireland (not marked)
- Canada (not marked)
- Australia (not marked)
- New Zealand (not marked)
- UAE and Gulf (not marked)
- International (not marked)
About the day
Carl Sagan Day is held on 9 November, the birthday of astronomer and science communicator Carl Sagan, born in 1934. According to National Today, it was created in 2009 by the Center for Inquiry in Fort Lauderdale, Florida Atheists and Secular Humanists (FLASH) and other groups. Sagan is best known for the 1980 PBS series Cosmos: A Personal Voyage and for his work with NASA, including the Voyager Golden Record.
People mark the day with star parties, astronomy lectures, science fairs, viewings of Cosmos or Contact and by reading his books. Posts use #CarlSaganDay.
The day suits planetariums, science museums, observatories, schools and universities, bookshops and science media.
Dates for the next three years
| Year | Date | Where | Status |
|---|---|---|---|
| 2026 | Monday 9 November 2026 | USA | Same date every year |
| 2027 | Tuesday 9 November 2027 | USA | Same date every year |
| 2028 | Thursday 9 November 2028 | USA | Same date every year |
Sectors this day suits
Types of business that could link their activity to this day.
- Planetariums
- Science museums
- Schools and universities
- Bookshops
- Science media
Questions and answers
When is Carl Sagan Day 2026?
Carl Sagan Day 2026 is on Monday 9 November 2026. It falls on the same date every year.
Who organises Carl Sagan Day?
Carl Sagan Day has no single organiser. Many organisations mark it independently.
When did Carl Sagan Day start?
Carl Sagan Day was first held in 2009.
Where is Carl Sagan Day marked?
Carl Sagan Day is marked in the USA.
Where do these details come from?
We checked these details against one source, including National Today: Carl Sagan Day. They were last checked on 7 November 2026.
Where this information comes from
Spotted a mistake? If you run this day, claim it to correct it.