HYPATIA MADE IT! It's a historic instrument probably used originally for measuring the altitudes of heavenly bodies and for determining their positions and movements. Although its origin is ancient and obscure, its invention is frequently ascribed either to Hipparchus or to Apollonius of Perga. For many centuries it was used by both astronomers and navigators.
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A plane intersects a line at a point, and i plane intersects another plane at a line.
Into plane
sagittal plane is a vertical plane that divides sth to left and right parts coronal plane is a vertical plane that divides sth into anterior and posterior parts
Point
It could be a plane.