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.
With three measurers come three PAIRS of measurements. This means three independent calculations of Earth's radius.
September 23, 2025 at 11:27 PM
With three measurers come three PAIRS of measurements. This means three independent calculations of Earth's radius.
Not unexpected, but participation is starting off slowly. I am hopeful that participation now will encourage more participation later. The best part is, every equinox's astronomical conditions are identical, so previous entries can still be part of the calculation!
We have three data points so far.
We have three data points so far.
September 23, 2025 at 11:27 PM
Not unexpected, but participation is starting off slowly. I am hopeful that participation now will encourage more participation later. The best part is, every equinox's astronomical conditions are identical, so previous entries can still be part of the calculation!
We have three data points so far.
We have three data points so far.
Unfortunately, it's cloudy where I am today. I was prepared to take three classes outside to measure shadows! But I won't be able to contribute any measurements today. I'll try again in the spring!
September 22, 2025 at 3:28 PM
Unfortunately, it's cloudy where I am today. I was prepared to take three classes outside to measure shadows! But I won't be able to contribute any measurements today. I'll try again in the spring!
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
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
June 13, 2025 at 3:05 AM
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
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