Learn all the about the life and major accomplishments of Eratosthenes of Cyrene--one of the most famous Greek mathematicians of all time.

This site, which is provided for by the Cornell University, gives a description of how Eratosthenes used geometry to measure the circumference of the earth.

For this task, students must investigate an experiment by Eratosthenes where he estimated the circumference of the Earth. It requires collaboration with at least one other school. Aligns with G-MG.A.

Learn how Greek mathematician Eratosthenes used geometry to estimate the circumference of the Earth.

Explains what Prime Numbers are and how to find them. Includes a list of primes under 200 and discusses the Sieve of Eratosthenes. This site has numerous links to other internet sources regarding prime numbers.

Discover all the primes up to the number 400 by using this interactive table. Simply click on a number and its multiples disappear.

Named after the Greek Mathematician. This classic method of finding prime numbers is also great for teaching about factors and multiples. The visnos sieve allows for multi colored squares this allows identification of any numbers prime...

This site from EraNET provides a description of the contributions made by Eratosthenes to astronomy.

This site from EraNET provides a description of the contributions made by Eratosthenes to astronomy.

This site, which is provided for by the University of St Andrews, gives an extensive biography of Eratosthenes detailing his accomplishments in mathematics and astronomy.

This lesson focuses on prime numbers, numbers that can only be divided by one and itself. It explains the Fundamental Theorem of Arithmetic and the Sieve of Eratosthenes. Includes practice activities.

Educator, Adam Savage, shares two astounding examples of profound scientific discoveries that came from simple, creative procedures: Eratosthenes' calculation of the Earth's circumference and Hippolyte Fizeau's measurement of the speed...

This interactive unit explain what prime numbers are and how to find them. It also discuss the Sieve of Eratosthenes and the Mersenne number.

Discusses the influences of other cultures on ancient Greek astronomers, and the advances made by the Greeks. It highlights major astronomers and those who contributed important ideas from the 6th to the 2nd centuries BC, including...

Science students often have difficulty thinking about large spatial scales. The purpose of the exercise is to redo Eratosthenes' calculation of the radius of the Earth using data from to sites in ancient Egypt. The excercise teaches...

Understanding that perceptions of the Greek world changed over time is important to reading Greek literature. The perceptions of Homer, Hecateus, Eratosthenes, and Ptolemy are presented as map frames at this site. Consider how Homer's...

Explains how the rotation and the axial tilt of the Earth are responsible for the phenomenon of day and night. Provides information about the Sun, the solar system, and the Earth, and how the circumference of the Earth was first measured...

Reinforce your knowledge about prime and composite numbers. Geogebra plugin required.

In this project, you will estimate the circumference of the earth, using a method developed about 2,200 years ago, by Eratosthenes, a Greek mathematician and the librarian of the great library at Alexandria, in Egypt.

Contains information about the life and works of Archimedes. Includes a Pi applet. Has links to Eratosthenes of Cyrene, A listing of Pi to 10,000 digits, a biography of Archimedes, notes on Pi, and sources on Archimedes' screw.

Exploring Prime Numbers is a hands-on, minds-on math lesson that engages learners in the discovery of prime numbers through the construction of multiplication arrays. Students then extend on their background knowledge of multiples and...

Discusses the evolution of ideas about the cosmos, from the Magic Cosmology of the Neolithic age to the stage of Mythical Cosmology, to the Geometric Cosmology of the ancient Greeks. The third stage advocated a rational approach to...

The Hellenic Electronic Center offers extensive information about Alexandria starting with its founding by Alexander to contemporary times. Describes the achievements of the city and its decline because of other sea routes for trade.

Despite popular myth, people of the 15th century actually realized that the earth was round. Some scientists had even estimated the size of the Earth. Here's an interesting explanation from a section of an online textbook on the...