Carl Sagan's Cosmic Calendar
MEDET TLEUGABYLULY LIMITED Education
Explore 13.8 billion years of cosmic history in one calendar year.
- Downloads
- 3+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Sep 10
- 2026 · v1.1.0
Screenshots
About Carl Sagan's Cosmic Calendar
Explore the history of the universe on a scale you can understand.
Cosmic Calendar compresses 13.8 billion years into a single calendar year. The Big Bang begins on January 1, Earth forms in September, and humans appear on December 31.
• Swipe through cosmic events, from the first atoms and stars to life on Earth and human history.
• Follow each event’s place in the calendar and see how long ago it happened.
• Open event details for explanations and scientific sources.
• Search the timeline and browse interesting cosmic facts.
• Choose animated backgrounds or a simpler static view.
Inspired by Carl Sagan’s cosmic calendar. Many dates are approximate and are identified as such in the app.
Support: https://tsx.nz/cosmic/support.html
Privacy: https://tsx.nz/cosmic/privacy.html
Cosmic Calendar compresses 13.8 billion years into a single calendar year. The Big Bang begins on January 1, Earth forms in September, and humans appear on December 31.
• Swipe through cosmic events, from the first atoms and stars to life on Earth and human history.
• Follow each event’s place in the calendar and see how long ago it happened.
• Open event details for explanations and scientific sources.
• Search the timeline and browse interesting cosmic facts.
• Choose animated backgrounds or a simpler static view.
Inspired by Carl Sagan’s cosmic calendar. Many dates are approximate and are identified as such in the app.
Support: https://tsx.nz/cosmic/support.html
Privacy: https://tsx.nz/cosmic/privacy.html
What’s new
Version 1.1.0 · Updated September 10, 2026
Explore the cosmic timeline with event search, scientific sources, and a simpler static viewing option.
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