Welcome to the Sun Shadow
You are invited to take part in a science collaboration
as a participant in a global Eratosthenes Project. The Eratosthenes Project is named
in honor of Eratosthenes of Cyrene (now known as Libya, North Africa). Erastothenes
(275-195 B.C.) was a scholar, and for many years was the Director of the Library of
Alexandria. Eratosthenes made many contributions to Science and Mathematics but it
was his accurate measurement of the Earth's circumference, using differences in the
Sun's altitude and shadows between two different locations, that we seem to remember
him mostly for.
On the day
of the 2005 September equinox,
September 22 (2223 U.T.),
(or during the week before or after), participating students from both the
southern and northern hemispheres will measure the mid-day altitude of the Sun and
take pictures of mid-day shadow at their location. This mid-day measurement
will be used by the students to determine the circumference of the Earth,
while the pictures will be sent to the SunShIP web site for a display of mid-day
shadows from various latitudes.
Check the FAQ page for more information about participating in
the project, and also look at the Links page for lessons, activities and other
resources relevant to the investigation of our Sun.
Use the button on the FAQ page to add your location to the Guest Map.
I will be in Ecuador from the 14th through the 30th. After
the 24th I will be away from 'civilization' while climbing and thus will not have
access to Internet until the 29th, or when I get home on the 30th. So any data sent
after the 24th will not be forwarded to Brian to send out certificates until my return.
The same for any pictures sent. I will post these as soon as I can after my return.
See some pictures from my mountaineering in Ecuador with
Edison Ona. Click on the Ecuador 2005 link.
Thank you in advance for your interest.