#ifndef DAYFRACTIONINCLUDED
#define DAYFRACTIONINCLUDED

#include "TTimeStamp.h"

/*! the 'dayfraction' is a number between 0 and 1, that respresents a full siderial day --
 *  a source makes a full circle in the sky when going from 0 to 1 */



inline double dayfraction_to_time( double dayfraction ) {
	static TTimeStamp T0 (2020, 1, 1, 0, 0, 0 );
	TTimeStamp T;
	T.SetSec( T0.GetSec() + dayfraction * siderial_day() );
	return T;    
}

inline double dayfraction_to_coszenith( double ra, double decl, Det& det, double dayfraction )
{
	TTimeStamp T = dayfraction_to_time(dayfraction);
	EquatorialCoords eq( ra, decl );                        
	Vec d = -eq.track_direction( det , T );
	return d.z;
}



#endif