import { EquatorialSphericalCoordinates } from '../coordinates/types/CoordinateTypes';
export declare function getElongation(equCoordsObj: EquatorialSphericalCoordinates, equCoordsSun: EquatorialSphericalCoordinates): number;
export declare function getPhaseAngle(equCoordsObj: EquatorialSphericalCoordinates, equCoordsSun: EquatorialSphericalCoordinates): number;
export declare function getIlluminatedFraction(phaseAngle: number): number;
export declare function getPositionAngleOfBrightLimb(equCoordsObj: EquatorialSphericalCoordinates, equCoordsSun: EquatorialSphericalCoordinates): number;
export declare function isWaxing(chi: number): boolean;
export declare function getAngularDiameter(distance: number, trueDiameter: number): number;
export declare function getAngularSeparation(coords1: EquatorialSphericalCoordinates, coords2: EquatorialSphericalCoordinates): number;