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Corrections
Spotted an error? Tell us the page and the sentence, and we will check it against the sources.
Write to usClassrooms
Questions about the guides, the viewers or using the site in a lesson.
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Been to Chaco or the Yucatán at a solstice or equinox? Share what you saw.
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We check the sources
For corrections we go back to the published research before changing a word.
We reply and update
You get an answer within about three working days, and fixed pages show the new date.
Frequently asked questions
How fast do you reply?
Usually within three working days. Corrections are checked first.
Can I use your guides in class?
Yes. The PDFs are free to print and share for non-commercial teaching. See the terms of use.
Do you accept guest posts or paid links?
No. Everything on the site is written by the editors, and we do not sell links or placements.
See the sky the way they did
Open a viewer, pick a date and watch the sunrise point move along a real horizon. Then download the guides and take them outside.