Template:POTD/2007-01-08

From Wikipedia, the free encyclopedia

Picture of the day
{{{texttitle}}}

An animation showing how an obliquely cut torus reveals a pair of circles, known as Villarceau circles, named after the French astronomer and mathematician Yvon Villarceau. The circles have no known practical application, but are merely a curious and somewhat unexpected characteristic of the torus.

Animation credit: Kieff
Archive – More featured pictures...