Trust page last reviewed: June 2026
How this exhibit is kept trustworthy
This page explains how the exhibit chooses sources, labels uncertainty, handles corrections, and keeps unconfirmed material away from the learning pages.
How changes are handled
Facts are checked against named sources before they appear here. Important corrections are shown on the page they affect.
- Last reviewed
- June 2026
- Main facts
- Source checked
- Visitor data
- No accounts or forms
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A learning exhibit, not a live news feed
The Sagan Calendar is a public learning exhibit. It uses a one-year calendar as a scale model for the history of the universe, with dinosaurs late in December and humans almost at midnight on the last day. It is not meant to make ancient events look exact to the minute or second.
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Where the facts come from
The exhibit uses sources that readers, parents, and teachers can check for themselves. Preferred sources include space agencies, museums, universities, research institutes, primary scientific papers when needed, and established educational references.
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Why calendar dates are approximate
The real dates come from scientific evidence. The calendar positions are calculated as a learning scale. A placement helps readers see the scale, but it should not be read as exact certainty.
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How updates and corrections are handled
Science changes because people keep finding, measuring, checking, and correcting evidence. New discoveries are checked before the page changes. If a correction changes what a reader would understand, it should be visible.
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What readers see
Readers should see enough source information to check the main facts for themselves. Unconfirmed discoveries, rough notes, and rejected ideas are kept away from the learning pages until they are ready.
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Media and rights
Images, videos, audio, fonts, and other media are only used when the right to use them is clear. Simple drawn markers are used where an image is not needed.
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Privacy
This is a reading site. It has no accounts, comments, uploads, public forms, personalisation, gamification, live content automation, or automated public updates.
How source detail is shown
Major events include a source link or evidence note. The first reading layer keeps source detail brief, while article and evidence pages can show more context.
What this site should not ask for
- Visitors should not need an account to read the exhibit.
- The site should not ask children to submit personal information.
- New science items should not appear automatically without a source check.
- Stronger claims such as fully secure, no risk, or no tracking of any kind should not be made.
Image credit: NASA/JPL-Caltech. Background source: Age-Defying Star.