## ordinates

Noun

- plural form of
*ordinate*

- "Tetrahedral co-
**ordinates**" are a system of quadriplanar co-**ordinates**, the fundamental planes being the faces of a tetrahedron, and the co-**ordinates**the perpendicular distances of the point from the faces, a positive sign being given if the point be between the face and the opposite vertex, and a negative sign if not. - If (u, v, w, t) be the co-
**ordinates**of any point, then the relation u+v-Fw-fit=R, where R is a constant, invariably holds. - In the potential curves of the diagram the
**ordinates**represent the hourly values expressed - as in Tables II. - If the errors of the rectangular co-
**ordinates**of these lines are known, the problem of determining the co-**ordinates**of any star-image on the plate becomes reduced to the comparatively simple one of interpolating the co-**ordinates**of the star relative to the sides of the 5 mm. - This form of micrometer is of course capable of giving results of high precision, but the drawback is that the process involves a minimum of six pointings and the entering of six screw-head readings in order to measure the two co-
**ordinates**of the star.

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