Eratosthenes Measures the Earth
287 BC to 212 BC in Syracuse, Sicily Greece
Lesson Plans and Math Activities for This Topic
Biographical Info on MacTutor http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Eratosthenes.html
If, good friend, thou mindest to obtain from any small cube a cube the double of it, and duly to change any solid figure into another, this is in thy power; thou canst find the measure of a fold, a pit, or the broad basin of a hollow well, by this method, that is, if thou thus catch between two rulers two means with their extreme ends converging . . . Thus may it be, and let any one who sees this offering say "This is the gift of Eratosthenes of Cyrene".
Eratosthenes epigram on a column in Alexandria
Measuring the Circumference of the Earth:
Eratosthenes' Method http://astrosun2.astro.cornell.edu/academics/courses//astro201/eratosthenes.htm Measure the Earth Sci Project http://www.k12science.org/noonday/ Eratosthenes & the Earth's Diameter http://outreach.as.utexas.edu/marykay/assignments/eratos1.htm Math Forum Explains EM http://mathforum.org/library/drmath/view/57246.html Prime Number Sites:
Prime Number Quiz http://tqjunior.thinkquest.org/4116/History/prime.htm Prime Number Machine http://www.olympus.net/personal/7seas/pic.html Eratosthenes Sieve (Javascript demo) http://www.faust.fr.bw.schule.de/mhb/eratosiv.htm Eratosthenes Sieve - another demo http://ccins.camosun.bc.ca/~jbritton/jberatosthenes.htm Murderous Maths Prime Game http://www.murderousmaths.co.uk/games/primcal.htm The Prime Pages http://primes.utm.edu/ Largest Known Primes http://www.utm.edu/research/primes/largest.html#intro Patterns in Prime Numbers http://www.fermi.franken.de/wschildbach/primes.html Prime Number Cascade http://www.olympus.net/personal/7seas/pic.html
Prime numbers, trigonometry, math and geography,large numbers, proportion and ratio.