Here's how I used #Desmos to model a shadow's path across the ground on the solstice! You may find this method interesting or useful if you plan to join the MEaSURE Project this September, calculating Earth's radius in a global science experiment.
youtu.be/F1Pv80Vwukk

I'll have to finish this tomorrow...for now, here's a preview of my model!
youtube.com/shorts/m6zLG...

Doing a test experiment on today's solstice...results to follow!

Happy equinox! If you're interested in making a measurement, here is a demonstration of the submission process. I also include a review of the results/analysis available to the public.
youtu.be/PvO_FaWJnJI

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!

Happy 2nd day of Fall! Fortunately I had the day off today (Happy Rosh Hashanah) so I was able to process the data and crunch the numbers.

The results and data are available at my website now, but if you want to see a summary, read the thread!
sites.google.com/view/themeas...

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

Math teachers! I have your lesson plan for the next equinox...Monday, September 22.

Join a global experiment to calculate Earth's radius!
youtu.be/myvEWdLU_1E
#iteachmath #math #maths #teach

New short! First short, actually 😅
youtube.com/shorts/r9rtr...

@petraschwer.bsky.social Thank you for sharing my post! This experiment's first attempt was done with help from a school in Leinfelden-Echterdingen, not far from you!

Hello STEM teachers! As the school year wraps up and you begin to make plans for next year, I've got something you might like to check out!

This experiment can be done anywhere in the world, from elementary to advanced. See the video for details!
youtu.be/myvEWdLU_1E

To organize participation and distribute resources, I've built a simple website.

Whether you're curious or you want to participate, come check it out!
sites.google.com/view/themeas...

Hello! This is The MEaSURE Project.

I am organizing a bi-annual experiment among schools, students, and lifelong learners to measure Earth's radius.

Please watch this informational video. Consider participating, and spread the word!
youtu.be/myvEWdLU_1E