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Written by: WhichIsCorrect.com
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Last updated: July 31, 2017
Published on: July 27, 2017
4 thoughts on “Asteroid vs astroid”?
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This is incorrect information. Both are spelled correct. Though they have different meanings. Astroid (w/o “E” is a mathematical shape.
**An astroid is a particular mathematical curve: a hypocycloid with four cusps. Specifically, it is the locus of a point on a circle as it rolls inside a fixed circle with four times the radius. By double generation, it is also the locus of a point on a circle as it rolls inside a fixed circle with 4/3 times the radius. It can also be defined as the envelope of a line segment with an end point on each of the axes. It is therefore the envelope of the moving bar in the Trammel of Archimedes.
Its modern name comes from the Greek word for “star”. It was proposed, originally in the form of “Astrois”, by Joseph Johann von Littrow in 1838. The curve had a variety of names, including tetracuspid (still used), cubocycloid, and paracycle. It is nearly identical in form to the evolute of an ellipse.** Per Wikipedia.
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