Stella Octangula
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updated January 3, 2025

Description

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The Double Tetrahedron: A Geometric Marvel

The double tetrahedron, also known as the stella octangula or the compound of two tetrahedra, stands as a testament to the captivating world of geometry. This intriguing shape emerges when two tetrahedra interpenetrate, creating a structure that mirrors the symmetry of a regular octahedron.

A Stellar Connection

As a type of stellated polyhedron, the double tetrahedron is formed by extending the faces or edges of a polyhedron until they intersect new planes, resulting in a more complex and visually compelling shape. The double tetrahedron boasts 24 triangular faces, 24 edges, and 8 vertices, with a high degree of symmetry that mathematicians and enthusiasts alike find mesmerizing.

Historical Significance

The double tetrahedron has intrigued mathematicians for centuries. Notably, Johannes Kepler, the renowned mathematician and astronomer, studied this shape and referred to it as the "stella octangula." Kepler's exploration of polyhedra and their symmetries has left a lasting impact on the field of geometry.

Applications in Chemistry

Beyond its geometric allure, the double tetrahedron finds applications in the realm of chemistry. It serves as a model for visualizing the spatial arrangement of certain molecular structures, helping scientists understand how atoms can be symmetrically arranged around a central atom.

Platonic Connections

The double tetrahedron is closely related to the Platonic solids, particularly the tetrahedron and the octahedron. By combining the properties of these shapes, the double tetrahedron exemplifies geometric duality, offering a unique perspective on the interconnectedness of these fundamental forms.

A Balance of Art and Science

The double tetrahedron's structure and symmetry make it not only a mathematical wonder but also an object of visual delight. Its balance between complexity and harmony serves as a reminder of the beauty inherent in geometric forms.

 

(Dimension on picture is in mm, not m)

Model origin

The author marked this model as their own original creation.

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