Welcome to our "Shadows Around the World" project. We measure the length of shadow that is cast by a meter stick at Solar Noon. Participants are welcome. You can do this on any sunny day at Solar Noon. After sharing this with your students, you can tell them about Eratosthenes, who will always be remembered for the calculation of the Earth's circumference circa 240 BC, using trigonometry and knowledge of the angle of elevation of the Sun at noon in Alexandria and Syene (now Aswan, Egypt).
A 220 cm shadow was cast by a 100cm stick at Solar Noon on 12/14/2010
A 231 cm shadow was cast by a 100cm stick at Solar Noon on 12/18/2010 See more pictures below
Solar Noon UT
|Shadow in cm||School||Latitude||Longitude||City||
|12/14/2010||17:47:03||220||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|12/18/2010||17:48:59||231||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|12/21/2010||21:49:31||1,280**||Hutchison High School||64.8493||-147.8163||Fairbanks||Alaska||USA||Frida Shroyer|
|12/17/2010||18:17:00*||213||Talcott Mt||41.8097||-72.8311||Avon||Connecticut||USA||Tom Alena|
|12/21/2010||22:31||500||Chignik Lake School||56.2561||-158.7722||Chignik Lake||Alaska||USA||Marlene Schmitt|
|12/28/2010||17:53:56||223||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|1/09/2011||17:59:24||201||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|1/31/2011||18:05:45||175||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|2/4/2011||18:06:14||170||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|3/27/2011||17:57:22||82||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|6/5/2011||17:50||33||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|1/3/2012||17:56:40||204||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|1/5/2012||17:57:37||202||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
|3/6/2012||18:04||106||Morton Arboretum||41.8215||-88.0767||Lisle||Illinois||USA||Greg Lopatka|
spring is coming, see my latest pictures below.
* 29 minutes past Solar Noon
**I posted my measurement on Facebook and got the following as a partial
Math - the axial tilt of our fair planet is currently 23.4378°, so the Arctic Circle is at latitude ...66.5622°. Hutchinson High School is at 64.85° N, or 1.722° south of the point where the length of the shadow is infinite today. Your shadow, today, should be the arctangent of 1.722° = 59.7 meters from your 1.0 meter vertical - really serious bragging rights!!!
The 3° in my last post was a hint at the approximate error in the levelness of your measuring surface - should you wish to challenge your students. :-)
You can find your solar noon here
Solar Noon based on sunrise and sunset times you supply.
2. Calculate Solar Noon based on a specific longitude and date.
I have the solar noon for the Morton Arboretum listed below:
Morton Arboretum Youth Education Dept., Lisle, IL, US
Longitude: -88.0767 Latitude: 41.8215
|Tue, 06 Mar 2012 18:03:23 UT|
|Wed, 07 Mar 2012 18:03:09 UT|
|Thu, 08 Mar 2012 18:02:54 UT|
|Fri, 09 Mar 2012 18:02:39 UT|
|Sat, 10 Mar 2012 18:02:23 UT|
|Sun, 11 Mar 2012 18:02:07 UT|
|Mon, 12 Mar 2012 18:01:51 UT|
|Tue, 13 Mar 2012 18:01:34 UT|
|Wed, 14 Mar 2012 18:01:18 UT|
|Thu, 15 Mar 2012 18:01:01 UT|
|Fri, 16 Mar 2012 18:00:43 UT|
|Sat, 17 Mar 2012 18:00:26 UT|
|Sun, 18 Mar 2012 18:00:09 UT|
|Mon, 19 Mar 2012 17:59:51 UT|
|Tue, 20 Mar 2012 17:59:33 UT|
|Wed, 21 Mar 2012 17:59:15 UT|
|Thu, 22 Mar 2012 17:58:57 UT|
|Fri, 23 Mar 2012 17:58:39 UT|
|Sat, 24 Mar 2012 17:58:21 UT|
|Sun, 25 Mar 2012 17:58:03 UT|
|Mon, 26 Mar 2012 17:57:45 UT|
|Tue, 27 Mar 2012 17:57:27 UT|
|Wed, 28 Mar 2012 17:57:09 UT|
|Thu, 29 Mar 2012 17:56:51 UT|
|Fri, 30 Mar 2012 17:56:33 UT|
|Sat, 31 Mar 2012 17:56:15 UT|
|Sun, 01 Apr 2012 17:55:57 UT|
|Mon, 02 Apr 2012 17:55:39 UT|
|Tue, 03 Apr 2012 17:55:22 UT|
|Wed, 04 Apr 2012 17:55:05 UT|
|Thu, 05 Apr 2012 17:54:47 UT|
Use decimal degrees. Enter east longitudes as positive numbers, west longitudes as negative numbers.
|Solar Noon at Hutchison High School in Fairbanks Alaska|
|Tue, 06 Mar 2012 22:02:19 UT|
|Wed, 07 Mar 2012 22:02:04 UT|
|Thu, 08 Mar 2012 22:01:49 UT|
|Fri, 09 Mar 2012 22:01:34 UT|
|Sat, 10 Mar 2012 22:01:18 UT|
|Sun, 11 Mar 2012 22:01:02 UT|
|Mon, 12 Mar 2012 22:00:46 UT|
|Tue, 13 Mar 2012 22:00:29 UT|
|Wed, 14 Mar 2012 22:00:12 UT|
|Thu, 15 Mar 2012 21:59:55 UT|
|Fri, 16 Mar 2012 21:59:38 UT|
|Sat, 17 Mar 2012 21:59:21 UT|
|Sun, 18 Mar 2012 21:59:03 UT|
|Mon, 19 Mar 2012 21:58:45 UT|
|Tue, 20 Mar 2012 21:58:28 UT|
|Wed, 21 Mar 2012 21:58:10 UT|
|Thu, 22 Mar 2012 21:57:52 UT|
|Fri, 23 Mar 2012 21:57:34 UT|
|Sat, 24 Mar 2012 21:57:15 UT|
|Sun, 25 Mar 2012 21:56:57 UT|
|Mon, 26 Mar 2012 21:56:39 UT|
|Tue, 27 Mar 2012 21:56:21 UT|
|Wed, 28 Mar 2012 21:56:03 UT|
|Thu, 29 Mar 2012 21:55:45 UT|
|Fri, 30 Mar 2012 21:55:27 UT|
|Sat, 31 Mar 2012 21:55:09 UT|
|Sun, 01 Apr 2012 21:54:52 UT|
|Mon, 02 Apr 2012 21:54:34 UT|
|Tue, 03 Apr 2012 21:54:16 UT|
Frida measured the shadow of a meter stick at solar Noon on 12/21/2010
The Shadow measured 12.8 meters
Solar Noon at Hutchison High School in Fairbanks Alaska
We had snow and clouds in Illinois, but Friday had clear skies in Fairbanks and captured these beautiful pictures. You can click on this image to see the full resolution picture.
The solar noon shadow was measured at 163 CM on the last day of January 2011. That is 52 CM shorter since 12/18/2010
The days are getting longer and our solar noon meter stick shadow is getting shorter. This is the first day that we have had sunshine at solar noon since 12/18/2010.
Students in Avon, Connecticut measured this shadow 4 days before the Winter Solstice and 29 minutes after Solar Noon. That may be close to a Solar Noon measurement on the Winter Solstice. The latitude at Talcott Mt is 41 deg 48' 39.37"N, our longitude is 72 deg 47' 55.34"W.
On June 5, 2011, the shadow cast by a 100 Cm stick had shrunken to 33cm.
On February 1-2, we got hit with 22.1 inches of snow. I finally got down to the pavement on 2/4/2011 so that I could measure the solar noon shadow. I rigged up a 2x4 to hold the meter stick pointing to the zenith. The solar noon shadow was measured at 159 CM on the 4th day of February 2011. That is 56 CM shorter since 12/18/2010. Will we get to 35CM on the summer solstice like we did in 1999?
I posted Blizzard pictures here.
January 3, 2012, we had 1 cm of snow yesterday, but it is gone today. The shadow of a 100 cm stick was 205cm.
We finally got some sun on the winter solstice in 2012. I put my grandson to work after his Christmas play. The clouds came just at we got to solar noon. The shadow was over 200 cm.
The following page was posted in 1999
This project was conceived at the
GLOBE Charleston workshop in October 1999.
Students will measure the length of the shadow that is cast at solar noon by a meter stick (100 cm.) that is perpendicular to the ground. We are looking for students with different Latitudes to send us data.
1. Place a Meter stick perpendicular to the pavement and trace the shadow
at Solar noon.
2. Use a compass to record the direction that the shadow is pointing.
(It should be pointing north if it is Solar Noon.)
3. Measure the length of the shadow and e-mail it to Mr. Greg Lopatka
along with your latitude, longitude, date and time.
4. Answer the questions below.
Your GPS unit can be used to
determine the exact time. This is a great time to make your cloud
Some questions for students:
Go to the following site to find your Sunrise, Sunset and Solar noon times:
Check out the short shadow on the
first day of summer!
|19:46|| Cascade Christian
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