School

Location

Teacher

Class & Grade Range

Latitude / Longitude

Method Used mstick, 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) 
mstick 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 12/03/12:63.3^{o} Tuesday 12/04/12: 63.4^{o} 
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 63.3^{o} 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 7.7047^{o}, NOAA's Latitude/Longitude Distance Calculator indicates our Latitude distance between Greenwich and Jasper County is 856 Km. Also, our sun angle diffence is 8.9^{o}. 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 
58

1 deg 6' 36'' N, 36 deg 40' 48'' E

Vertical Meter Stick & Plum Line

TBA

XX^{o}

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

XX^{o}

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

XX^{o}

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

XX^{o}

TBA

TBA 
Jasper County High School

Monticello, GA USA

Tyson Hardy 
Honors Physics, grades 912, 57 students 
Lat: 33.3367213 N
Long: 83.7143554 (83.7143554 W) 
Vertical Meter Stick & Plum Line

Height 1.0m/ Shadow 1.395m

54.4^{o}

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 protractorbyhand 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 NorthSouth distance of 856 Km. Using our respective sun angles, we calculated a centeroftheEarth angle of 8.9 degrees. Using the proportion: 8.9/360 = 856/circumference, we calculated circumference as 34,600km. Using the true northtosouth 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 ratchewed meter sticks we used! 
Tehachapi High School

Tehachapi, CA USA

Angela Guy 
Earth Science and Physics Classes, 912, ~300 students 
35.12^{o}N
118.44^{o}W 
Vertical Meter Stick & Plum Line

TBA

XX^{o}

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

XX^{o}

TBA

TBA 
Onywera Mixed Secondary School.

Sindo, Kenya

Paul Mollinger

912

0.53333 S and 34.16667 E

Meter Stick and Flag Pole

TBA

TBA

TBA

TBA
