Earth Project - Earth, Sun, Moon movement activity
Welcome to Study Guides!

Earth Dance

To get a better idea of how the Earth moves around the Sun, work in groups of three people. One person is the Sun and stands in the middle, just standing still. The second person is the Earth, and slowly walks in a large circle around the Sun while spinning around like a top at the same time (this is pretty hard; take it slowly). The third person is the Moon, who walks in small circles around the Earth, always facing towards the Earth. Once you get some practice, trade places so everyone gets a chance to be the Earth.

An eclipse of the moon
An eclipse of the moon
You can see the curved shadow of the Earth.

You can see for yourself that the Earth is round like a ball. One way is to observe an eclipse of the moon - when you see the shadow of the Earth on the Moon, you will see that the shadow is curved, because the Earth itself is curved like a ball. Here's a video of an eclipse of the Moon, in case you've never seen one yourself:

Another way to see that the Earth is round is to go to a seaport and watch ships disappearing over the horizon: the bottom part of the ship vanishes first, and then the top. That's because the earth is curved. If the earth were flat, the whole ship would gradually get smaller until you couldn't see it anymore.

If you travel, and know how to recognize the constellations, you can also see that different stars appear in the sky from different parts of the earth. If the earth were flat, we should all see the same stars.

More about the Earth

Bibliography and further reading about planets:

Physics home

LIMITED TIME OFFER FOR TEACHERS: Using this article with your class? Show us your class page where you're using this article, and we'll send you a free subscription so all your students can use Study Guides with no distractions! (Not a teacher? Paid subscriptions are also available for just $16/year!)
Please help other teachers and students find us: link to this page from your class page.
Karen Carr is Associate Professor Emerita, Department of History, Portland State University. She holds a doctorate in Classical Art and Archaeology from the University of Michigan. Follow her on Instagram or Twitter, or buy her book, Vandals to Visigoths.
Cite this page
  • Author: K.E. Carr
  • Title:
  • Site Name: Study Guides
  • Publisher:
  • Date Published:
Did you find what you needed? Ask your teacher to link to this page so other people can use it too! Send it in and win a "Great Page!" award!
Sign up for more free articles and special offers in' weekly newsletter:
We will never share your e-mail address unless you allow us to do so. View our privacy policy. Easy unsubscribe links are provided in every email.
Comment on This Article

Does your class page honor diversity, celebrate feminism, and support people of color, LBGTQ people, and people with disabilities? Let us know, and we'll send you a Diversity Banner you can proudly display!
Looking for more? is loading comments...
(Comments will appear after moderation, if they are kind and helpful. Feel free to ask questions, and we'll try to answer them.)
Cite this page
  • Carr, K.E. . Study Guides, . Web. 30 April, 2017