Welcome to the Sun Shadow Investigation Project. The project is no longer active however much of the information including dates for this year's equinox are correct. Thank you for your interest. To see the project web site from previous years click on the appropriate link: SunShIP 2004 - SunShIP 2005 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 or around the day of an equinox (see FAQ for the dates this year) students could measure the mid-day altitude of the Sun and/or take pictures of a 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 to be included in a gallery of mid-day shadow pictures. 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. Celebrate Sun-Earth Day 2011 (Ancient Mysteries - Future Discoveries) on March 19th. Visit the NASA web site for more information about educator resources. Sun-Earth Day Use the button on the FAQ page to add your location to the Guest Map. Thank you in advance for your interest. Clear Skies... Bob Riddle