De revolutionibus orbium coelestium

High school (ages 12+)
Space & Astronomy

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/de-revolutionibus-orbium-coelestium

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. Who wrote De revolutionibus orbium coelestium?Nicolaus Copernicus
2. What is De revolutionibus orbium coelestium known for?Formal proposal of the heliocentric model of the solar system
3. What is the book's full title?De revolutionibus orbium coelestium
4. What is the publication date?March 23, 1543
5. Why did Copernicus write the book?The old Earth-centered model was too complicated and hard to explain. Copernicus wanted a simpler, more elegant system.
6. How did the book change the way people saw the Earth and Sun?It said the Earth moves around the Sun, which changed people’s idea that Earth was the center of everything. It also explained why planets sometimes look like they move backward.

Heliocentric Model: An astronomical model positing the Sun as the central body around which planets revolve.
Geocentric Model: An astronomical model with the Earth as the stationary center of the universe, orbited by celestial bodies.
Paradigm Shift: A fundamental change in the basic concepts and experimental practices of a scientific discipline.
Retrograde Motion: The apparent backward movement of planets in the sky, explained by the heliocentric model.