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Welcome


School
Location
Teacher
Class & Grade Range
Latitude / Longitude
Method Used
m-stick, flag pole...
Measurement
Height / Length of Shadow
Angle of Sun's rays
Earth Circumference
Comments
Greenwich High School
Connecticut, USA
Daryl Taylor
Astronomy - 11 & 12
Lat : 41.041418 N
Long : -73.612797 (or 73.612797 West)
m-stick with plum bob
Monday 12/03/12: Height: 1.0m / Length of Shadow: 1.99m

Tuesday 12/04/12: Height: 1.0m / Length of Shadow: 2 m (not a sharp image)

Monday 12/03/12:63.3o

Tuesday 12/04/12: 63.4o

39,996 Km
Monday 12/03/12:We took 5 different measurements via 5 groups of 3 kids each. These were all done at our local noon (11:44AM ET) on Monday 12/03/2012. The average shadow length using a vertically placed meter stick was 1.99 m. This yields a "sun angle" of 63.3o above vertical. As soon as we have other school's data, we will perform our circumference calculations.

We will also update our measurements each day of this week so other schools can match our day.

Tuesday 12/04/12: Same method as above, but slightly longer shadow average at 2 m. Mostly cloudy so had a hard time getting an accurate clear shadow length.

[Updated and corrected 12/07/12 6:20AM] For our first calculation, we used Jasper County High School as our data partner. With a Latitude difference of 7.7047o, NOAA's Latitude/Longitude Distance Calculator indicates our Latitude distance between Greenwich and Jasper County is 856 Km. Also, our sun angle diffence is 8.9o. Then, it's a simple proportion: C/856 = 360/8.9. This yields our circumference calculation of 34,625 Km. Not bad! The accepted Latitude Circumference of Earth is 40,008 Km, so our %error is less than 14! So, I'd give us an 86% on this first run.. Thanks to Tyson Hardy for correcting my bar napkin calculations previously posted.

The Barstow School
Kansas City, MO USA
David Beier
5-8
1 deg 6' 36'' N, 36 deg 40' 48'' E
Vertical Meter Stick & Plum Line
TBA
XXo
TBA
TBA
Crestwood Middle School
Mountaintop, PA USA
Darlene Kellner
8th grade Earth & Space Science 10
41.139849 N
75.902784 W
Vertical Meter Stick & Plum Line
TBA
XXo
TBA
TBA
Magnolia High School
Anaheim CA USA
Bev Berekian
Earth Science, 9th Grade, 175 students
Latitude: 33 48 56N
Longitude: 117 58 14W
Vertical Meter Stick & Plum Line
TBA
XXo
TBA
TBA
South Carolina Virtual Charter School
Myrtle Beach, SC, USA
Pat Pierce
1 group: 2 seventh graders and 2 eighth graders
33 degrees 41' 49" North
78 degrees 52'39" West
Vertical Meter Stick & Plum Line
TBA
XXo
TBA
TBA
Jasper County High School
Monticello, GA USA
Tyson Hardy
Honors Physics, grades 9-12, 57 students
Lat: 33.3367213 N
Long: -83.7143554 (83.7143554 W)
Vertical Meter Stick & Plum Line
Height 1.0m/ Shadow 1.395m
54.4o
TBA
Monday 12/03/12: Height: 1.000m / Length of Shadow: 1.395m We took 17 independent measurements (in teams of 3 students) at local noon (12:25pm EST) in full sun. The average shadow length from a vertically placed meter stick was 1.395m (with standard deviation of 0.052m). Using that average shadow length, we calculated sun angle at 54.4 degrees (via trigonometry, compared [if anyone cares] to a crude protractor-by-hand measurement of 55 +/- 1 degrees). Go Eratosthenes!

Partnering with Daryl & Friends in Greenwich, Connecticut, we verify his students' Earth circumference calculation (interestingly, a few of my students got confused and thought these Connecticutters were across the pond in England; needless to say, the other students set their prime meridians straight!). Our two locations' latitude difference of 7.7047 degrees corresponds to a North-South distance of 856 Km. Using our respective sun angles, we calculated a center-of-the-Earth angle of 8.9 degrees. Using the proportion: 8.9/360 = 856/circumference, we calculated circumference as 34,600km. Using the true north-to-south circumference of Earth at 40,008km, our % Error = 13.5. We're blaming our lack of precision on those recycled electrons from Connecticut . . . then again, it could be those rat-chewed meter sticks we used!

Tehachapi High School
Tehachapi, CA USA
Angela Guy
Earth Science and Physics Classes, 9-12, ~300 students
35.12oN
118.44oW
Vertical Meter Stick & Plum Line
TBA
XXo
TBA
TBA
Thornton Fractional South High School
Lansing, IL USA
Ouida Bradford and Angela Germeraad
11 - 12 Grade Students 30 students
Lat: 33.3367213 N
Long: -83.7143554 (83.7143554 W)
Vertical Meter Stick & Plum Line
TBA
XXo
TBA
TBA
Onywera Mixed Secondary School.
Sindo, Kenya
Paul Mollinger
9-12
0.53333 S and 34.16667 E
Meter Stick and Flag Pole
TBA
TBA
TBA
TBA