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1. Eratosthenes' Sieve

   click on a number and watch while its multiples are highlighted. Keep choosing numbers until all the prime numbers between 2 and 400 have been discove

   http://www.faust.fr.bw.schule.de/mhb/eratclass.htm...

2. Eratosthenes

   (276 - 195 B.C.) used geometry to estimate the circumference of the Earth. measured the altitude of the noontime sun at Alexandria at its maximum

   http://astrosun2.astro.cornell.edu/academics/courses//astro201/eratosthenes.htm...

3. The Round Earth and Christopher Columbus

   The Round Earth and Christopher Columbus Site Map Lesson plan Glossary Timeline Questions & Answers Central Home Page (8) The Round Earth and Christop

   http://www-spof.gsfc.nasa.gov/stargaze/Scolumb.htm...

4. Earth's Mass - EnchantedLearning.com

   Earth's Mass - EnchantedLearning.com Advertisement. EnchantedLearning.com is a user-supported site. As a bonus, site members have access to a bann

   http://www.allaboutspace.com/subjects/astronomy/planets/earth/Mass.shtml...

5. Astronomers-Zoom Astronomy Glossary

   Astronomers-Zoom Astronomy Glossary Advertisement. EnchantedLearning.com is a user-supported site. As a bonus, site members have access to a banner-ad

   http://www.allaboutspace.com/subjects/astronomy/glossary/Astronomers.shtml...

6. CosmicQuest @ The Children's Museum of Indianapolis

   CosmicQuest @ The Children's Museum of Indianapolis Ancient Astronomers Aristotle (384 B.C. - 322 B.C.) Aristotle believed that the universe was s

   http://www.childrensmuseum.org/cosmicquest/fieldguide/astro_ancient.html...

7. Greek Astronomy - the Sun - History for Kids!

   Greek Astronomy - the Sun - History for Kids! Greek Astronomy for Kids - the Sun - what did the Greeks know about the sun, and how did they figure it

   http://www.historyforkids.org/learn/greeks/science/astronomy/sun.htm...

8. H.B. Meyer Homepage

   H.B. Meyer Homepage Faust-Gymnasium Staufen Mhb's Mathe-Seiten Mhb's Math'-pages Willkommen, hier finden Sie: Welcome, here you can find:

   http://www.faust.fr.bw.schule.de/mhb/index.html...