quadrature

The process of making something square.

The process of constructing a square equal in area to a given surface.

A configuration in which the position of one celestial body is 90° from another celestial body as measured from a third body, typically Earth.

In electricity, phase difference of 90°, or one quarter period.

In geometry, the act of squaring an area; the finding of a square or several squares equal in area to a given surface.

A quadrate; a square space.

The relative position of two planets, or of a planet and the sun, when the difference of their longitudes is 90°.

But when armillæ were employed to observe the moon in other situations … a second inequality was discovered, which was connected, not with the anomalistical, but with the synodical revolution of the moon, disappearing in conjunctions and oppositions, and coming to its greatest amount in quadratures. What was most perplexing about this second inequality was that it did not return in every quadrature, but, though in some it amounted to 2° 39′ , in other quadratures it totally disappeared.

A side of a square.

The act of squaring; the finding of a square having the same area as some given curvilinear figure; ; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of abscissas.