Peter Barthel initiated the production of a sun-moon-earth model (Tellurium), to be used in primary education. The Tellurium was produced by Nienhuis/Heutink, a firm specialized in Montessori education, and can be ordered from their website.
![](https://peterbarthel.nl/wp-content/uploads/2017/09/tellurium2-300x197.jpg)
Astrophysics professor at the Kapteyn Institute of the University of Groningen
Peter Barthel initiated the production of a sun-moon-earth model (Tellurium), to be used in primary education. The Tellurium was produced by Nienhuis/Heutink, a firm specialized in Montessori education, and can be ordered from their website.