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Opis1911 Britannica - Astronomy - Earth section.png
English: Celestial Mechanics. Represent a section of the earth through its axis AB, ECQ being a diameter of the equator. Illustration from 1911 Encyclopædia Britannica, article Astronomy.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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