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Measuring the Earth

September 20, 2023 @ 12:00 pm 1:30 pm PDT

Geometry literally means “Earth measure”. Join us as we meet along a common meridian to celebrate math and measure our planet.

With some simple geometry and some friends on Zoom, we can measure the polar circumference of the Earth. This task was first done by Eratosthenes (276 BCE – 195/194 BCE). We will watch shadows along the meridian that runs north-south through San Mateo CA, Portland, OR, Seattle, WA, and Prince George, BC. Using these measurements we will calculate the distance around the earth through the poles. We will explore how to make a connection with a partner along your longitude line and how to run the activity.

We are honored to be joined by the education team at The Exploration Place in Prince George.

Join John Muir Laws for weekly live nature Journaling workshops with tips, techniques, inspiration, teaching strategies, and interviews. Topics are usually announced in advance of the workshop. If unique materials or class-specific downloads are available, you can find them here in the class description before the class. All ages and experience levels are welcome. No registration is necessary.

Suggested donation: $20. Your donation helps support me and my family. Your generosity is deeply appreciated and it makes an immediate difference in my ability to continue to offer these programs. Your donation is tax-deductible. Click here to donate. If you cannot donate at this time, no problem–please continue to enjoy the classes and find another way to pay it forward in your community with acts of kindness and service. Thank you!

If you are new to Zoom or are having trouble with the meeting controls, please see these notes and suggestions on Zoom Tips for Online Classes with John Muir Laws to help you get more out of the online workshop. When possible I will also make a recording of the workshop and post it on my blog. I look forward to seeing you there!


  • Your Journal and favorite drawing materials. Taking notes while you watch and participate will help you remember the new techniques and incorporate them into your journaling.
  • Your sense of humor!
$20 Suggested Donation

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