Definitionadj. not pertinent to the matter under consideration
Last update: September 3, 2015
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That there exists a point such that the tangents from this point to the four spheres are equal, and that with this point as centre, and the length of the tangent as radius, a sphere may be described which cuts, the four spheres at right angles; this "orthotomic" sphere corresponds to the orthogonal circle of a system of circles. [Please select]
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{Scanner's comment: The sign for Venus being an orthogonal cross or plus sign hanging vertically below a circle. [Please select]
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