
Fall 2007 Reports and Photos
St. Jude School : Final Report 
Collège Antonin Perbosc, Lafrançaise , France 
Our school is located in a suburb of Montreal, Canada, at 45:29N (latitude) and 73:29W (longitude). We are 28 students in grade 5(class5IA). Our teacher, Mrs. Mirza introduced this project to us in September. She explained to us how Eratosthenes performed a simple experiment 2200 years ago to measure the circumference of the Earth. His calculation is still considered accurate today by scientists.
We went on the Noonday website and did some research. At first, the whole idea appeared quite complicated to us. Most of us had trouble understanding some ideas and how they were going to help us determine the circumference of the Earth. But as we got more involved, the process started to become clear.
We carried out the shadow measurements on September 21 st 2007, which was as close as we could get to the Autumn Equinox (September 23 rd). The shadow measurements (99cm) at high local noon time (12:48pm) helped us determine our sun angle which was 44 degrees.
The next step was to choose a partner city whose sun angle could help us find the central angle. We decided to select Abba’s Orchard in Philippines, as it is far away. Their sun angle was 8.4 degrees. The difference between the two became our central angle, that is, 35.6 degrees.
Now Mrs. Mirza showed us how the central angle could be compared to a slice in a big circle. We could then understand that the arc of the central angle represented the distance between the two cities. Once we knew the North/South distance between us and Abba’s Orchard, by subtracting the 2 latitudes, we could then multiply the arc’s length with the number of slices in a circle. These are some of our calculations:
No. of slices= 360°divided by 35.6 degrees
=10.1
N/S distance= 4 116.25 km
Circumference of the Earth = 4116.25x 10.1 = 41, 574.12 km
Conclusions : We learned a great deal from this project. We now know how knowledge of angles helps us in real life, how the circumference is calculated and much more. Before doing this project we didn’t know a lot about latitude and longitude and what these lines help us find on the globe.
All of us are very proud of our learning. We can see how Math, Science and Technology work together in any scientific study.
Students of Class 5IA 

Collège Antonin Perbosc, Lafrançaise , France 
6 classes and 150 students have participated to the project.
We were lucky to have sun for all the measurements that we planned, except on the day of the equinox (23/09/2007). All the classes could calculate the circumference with a real partner. We never had those conditions on the European project. We apologize for not being able to publish all the results. We selected schools that had a photography.The other measures have been used for the final written test .
Localize the schools
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september 17
Lafrançaise, France
shadow: 90cm
angle:42.000°
Stanford, Kentucky USA, Home school
latitude: 37.533°
shadow: 72cm
angle:35.750°
distance: 733km circumference: 42221km
september 19
Lafrançaise, France
shadow: 92cm
angle:42.500°
New York, USA, The Dwight School
latitude: 40.470°
shadow: 82cm
angle:39.333°
distance: 372km circumference: 42291km
september 20
Lafrançaise, France
shadow: 93cm
angle:43.000°
Wharton, New Jersey USA, MacKinnon Middle School
latitude: 40.800°
shadow: 84cm
angle:40.000°
distance: 370km circumference: 44400km
september 21
Lafrançaise, France
shadow: 94.5cm
angle:43.333°
Yuba City, California, USA, Riverbend Middle School
latitude: 39.090°
shadow: 78.45cm
angle:38.100°
distance: 559km circumference: 38454km
Adélaïde, Australia, Hamilton Secondary college
latitude: 34.900°
shadow: 70cm
angle:35.000°
distance: 8791km circumference: 40401km
Warren, Oregon, USA, Warren Elementary School
latitude: 45.810°
shadow: 91.5cm
angle:45.100°
distance: 187km circumference: 38106km
Chillicothe, Ohio , USA, Unioto High School
latitude:39.367°
shadow: 79.1cm
angle: 38.344°
distance: 530km circumference: 38288km
september 24
Lafrançaise, France
shadow: 98.5cm
angle:44.500°
Baungon, Philippines: The Abba’s Orchard
latitude: 8.417°
shadow: 15.25cm
angle: 8.667°
distance: 3968km circumference: 39865km
Arras, France, école Lafontaine
latitude: 50.283°
shadow: 123cm
angle: 51,000°
distance: 683km circumference: 37828km
Maricopa, Arizona, USA, Wells Middle School
latitude:33.054°
shadow: 64cm
angle: 34.000°
distance: 1231km circumference:42206km
Gulf Breeze, Florida USA, Oriole Beach Elementary
latitude:30.367°
shadow: 56cm
angle: 30.000°
distance: 1529km circumference: 37961km
Virginia Beach, USA, Princess Anne Middle School
latitude:36.117°
shadow: cm
angle: 37.183°
distance: 820km circumference: 40346km
september 25
Lafrançaise, France
shadow: 100cm
angle:45.000°
New York, Brooklyn, USA ,Brooklyn Friends School
latitude:40.683°
shadow: 86cm
angle: 42°
distance: 413km circumference: 49560km
Wrocław, Poland, Liceum Ogólnokształcące
latitude: 51.110°
shadow: 118.5cm (gnomon : 102cm)
angle: 49.333°
distance: 776km circumference: 64468km
september 26
Lafrançaise, France
shadow: 100cm
angle:45.000°
Placerville, California, USA, Herbert Green Middle School
latitude:38.692°
shadow: 85.9cm
angle: 40°
distance: 604km circumference: 43488km
september 28
Lafrançaise, France
shadow: 104.5cm
angle:46.250°
Naples, Florida, USA, Pelican Marsh Elementary
latitude:26.100°
shadow: 62.5cm
angle:35°00'
distance: 2004km circumference: 64128km 
