The MEaSURE Project

@themeasureproject.bsky.social

Join a bi-annual, global experiment to calculate Earth's radius! I'm a STEM teacher based in Pennsylvania, USA looking to get classrooms around the world collaborating.

This Friday, March 20th, let's do an experiment! The sun is directly over the equator on the equinox, which means that you can directly determine your latitude with a shadow. If we are east/west of each other, the time difference between our noons gives us a longitude. We can measure the Earth!

1. Find a flat, level surface 2. Set up a vertical ruler 3. Find true North (northern hemisphere) or true South (Southern hemisphere) 4. Wait for the equinox 5. Measure the length of the shadow at solar noon 6. Record the time of solar noon (UTC) 7. Go to the MEaSURE website and submit your data