API Reference > geometry-core > CartesianGeometry > Ellipsoid > radiansPairToGreatArc radiansPairToGreatArc Method For a given pair of points on an ellipsoid, construct an arc (possibly elliptical) which passes through both points is completely within the ellipsoid surface has its centerEvaluate a point on the ellipsoid at angles give in radians. If the ellipsoid is a sphere, this is the shortest great-circle arc between the two points. If the ellipsoid is not a sphere, this is close to but not precisely the shortest path. radiansPairToGreatArc(thetaARadians: number, phiARadians: number, thetaBRadians: number, phiBRadians: number, result?: Arc3d): Arc3d | undefined Parameter Type Description thetaARadians number longitude, in radians, for pointA phiARadians number latitude, in radians, for pointA thetaBRadians number longitude, in radians, for pointB phiBRadians number latitude, in radians, for pointB result Arc3d optional preallocated result Returns - Arc3d | undefined Defined in core/geometry/src/geometry3d/Ellipsoid.ts Line 378 Last Updated: 13 June, 2024