Me and My Human,
Skaters at the Lasker Rink in Central Park are dwarfed by their
shadows, at least in this aerial view, Feb. 22, 2004.
Click on image for a larger view.
Sing a Song for
Longitude And Latitude!
See Space Song
discuss Eratosthenes and his Measurement
- Following in the Footsteps of
Eratosthenes: Measuring the Circumference of the Earth http://www.mapmonde.org/eratos/
impressive. In several different languages no less.
are some titles you will find in your favorite book store, library or
I found these books in the children's section
local library. If you find any good books, let me know and I'll add
to this list.
- Ferguson, Kitty. Measuring the Universe.
- Lasky, Kathryn. The Librarian who Measured the Earth. A must buy!
- Diggens, Julia. String, Straight Edge, and Shadow (p.
- Sagan, Carl. Cosmos. The
book and video from a PBS
of the same
- Coggins, Jack. By Star and Compass. The Story of Navigation
(p. 64-69) Good
explanation and diagrams.
- Moore, P. and Brinton, H. Exploring Maps. p. 13-15
- Gullberg, Jan. Mathematics: From the Birth of Numbers. p.
Eratosthenes really get the measurements right? According to Gullberg,
historians have done some fudging to make Eratosthenes look good. Since
his method was correct, why not give him the benefit of a doubt that he
used the right length for his unit of measure - the stadion? Apparently
there were at least seven different lengths for a stadion at that time.
- Adler, Irving. Shadows
- Gardner, Robert & Webster, David. Shadow Science
(Doubleday, 1976). The
authors take a fresh look and gives us clues about the world around us.
Titles of chapters include: Telling Time with Shadows, Finding North
Shadows, and Night is just a big Shadow. Contains a lot of puzzle
pictures. Great book.
- Severn, Bill. You and Your Shadow.
Eratosthenes Measurement Projects
- Charischak, Ihor. In the Spirit of Eratosthenes: Measuring
of the Earth. Learning &
with Technology, V. 25, N. 6 (ISTE, March, 1998)
- Charischak, Ihor. Bringing
the Vision of 21st Century Collaborative Projects Into Today's
Classrooms. Paper presented at the NCTM's
Format's Group Conference, Reston, VA, June, 1998
about the Noon Day Project in the News
- Cosmos #1: The Shores of the Cosmic Ocean (1980) Carl Sagan
1/2" video Color 1 cass., 60 min. Explores the
from clusters of galaxies to the Milky Way and earth. Discusses early
discoveries concerning measurement of the earth's circumference and its
spherical nature. Journeys through time from the Big Bang to the
present. Included in this video is a wonderful presentationn of Carl
telling the Eratosthenes measurement story. See link below (with French
Aristotle believed the earth was round, but he
round it was. King Ptolemy of Egypt offered an estimate of 18,000 miles
which Columbus used to his advantage in negotiating for his trip. (From
a PBS interview with author of Don't Know Much About the Cosmos.)
websites and other strange phenomena
Somewhere on or very near
the Tropic of Cancer or the Tropic
Congratulations to the students of Mr.
Hendrix Junior High in Chandler, AZ for being the first to come up with
dig a very deep hole, where I go to stop?
Was your mother right when she
said that if you dug a hole through the
earth to the other side you would wind up in China? Assuming you are in
New York City, how close to China would you end up? Not sure? Try this completely "stupid" use
of Google Maps