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How Many Days Until Carl Sagan Day?

Live astronomical countdown and cosmic facts for the next Astronomer Tribute.

82 Days Left
Target Date: Monday, November 9, 2026
Last verified: Wednesday, August 19, 2026

⏱️ Time Breakdown

  • Total Months span: ~2.7 months
  • Total Weeks factor: 11.7 weeks
  • Business Days Left: 58 Days
  • Target Day: Monday

📖 About Carl Sagan Day

Carl Sagan Day falls on November 9, Sagan's birthday, he was born in 1934 in Brooklyn, New York, and died in 1996. He was an astronomer and astrophysicist by training, but he's most widely remembered as a science communicator, his 1980 television series Cosmos: A Personal Voyage brought astronomy and the scale of the universe to a mass audience in a way no prior program had, and it remains one of the most watched public television series in history. He also wrote the novel Contact, later adapted into a film, co-founded The Planetary Society in 1980 to advocate for space exploration, and played a role in the Pioneer plaque and the Voyager Golden Record, physical messages attached to spacecraft intended for any future encounter with extraterrestrial intelligence.

How It's Observed

There's no official government designation behind the date, it's an informal observance kept mainly by astronomy educators, science communicators, and Sagan's fans, often marked with public talks, planetarium showings, or simply rewatching Cosmos.

Related

Leonids, World Space Week, Asteroid Day

Frequently Asked Questions

When is Carl Sagan Day in 2026? −
Monday, November 9, 2026, his birthday.
Who was Carl Sagan? +
An astronomer and astrophysicist best known for hosting the 1980 television series Cosmos, writing the novel Contact, and co-founding The Planetary Society in 1980.
Is Carl Sagan Day an official holiday? +
No, it's an informal observance with no government designation, kept mainly by science educators and Sagan's fans.
Why is Carl Sagan remembered specifically as a communicator? +
Cosmos reached a far larger general audience than academic astronomy typically does, and it's still cited as a major influence by many working scientists who first got interested in the field by watching it.