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AstroUtil

AstTime.h File Reference

Go to the source code of this file.

Namespaces

namespace  AstUtil

Functions

void CalendarToJulian (int year, int month, int day, double hour, double &juliandate)
void JulianToGMST (double juliandate, double &gmst)
void JulianToGAST (double juliandate, double &gast)
void GSTToLST (double gst, double longitude, double &lst)
void LSTToGST (double lst, double longitude, double &gst)

Function Documentation

void AstUtil::CalendarToJulian (  int  year,
int  month,
int  day,
double  hour,
double &  juliandate
) 
 

Definition at line 20 of file AstTime.cxx.

References julian_date().

Referenced by ANtpInfoObjectFiller::FillHeaderInformation(), NtpSRModule::FillNtpTrackCosmicRay(), and NCAnalysisCutsCR::IsGoodBeamSnarlBR().

00021                                                                   {
00022   // Static method to convert from calendar date to julian date (hours)
00023 
00024   juliandate = julian_date(year,month,day,hour); // nova routine
00025 
00026 }

void AstUtil::GSTToLST (  double  gst,
double  longitude,
double &  lst
) 
 

Definition at line 51 of file AstTime.cxx.

Referenced by AstUtil::CelestialToEquatorial(), AstUtil::EquatorialToCelestial(), ANtpInfoObjectFiller::FillHeaderInformation(), NtpSRModule::FillNtpTrackCosmicRay(), and AstValidate::TestJulianDateToSiderealTime().

00051                                                               {
00052   // Static method to convert from greenwich sidereal time (hours) to local 
00053   // sidereal time (hours) 
00054   // Longitude is expressed in degrees and east of 0^o is +, west -.
00055 
00056   lst = gst + longitude*12./180.; // hours
00057   if ( lst < 0. ) lst += 24.;
00058   if ( lst > 24. ) lst -= 24.;
00059 }

void AstUtil::JulianToGAST (  double  juliandate,
double &  gast
) 
 

Definition at line 38 of file AstTime.cxx.

References earthtilt(), and sidereal_time().

Referenced by NtpSRModule::FillNtpTrackCosmicRay(), and AstValidate::TestJulianDateToSiderealTime().

00038                                                             {
00039   // Static method to convert from julian date to greenwich
00040   // apparent sidereal time (hours)
00041 
00042   double oblm,oblt,eqeq,psi,eps;
00043   earthtilt(juliandate,&oblm,&oblt,&eqeq,&psi,&eps);
00044 
00045   double fracjuliandate = fmod(juliandate,1.);
00046   double intjuliandate = juliandate - fracjuliandate;
00047   sidereal_time(intjuliandate,fracjuliandate,eqeq,&gast); // nova routine
00048  
00049 }

void AstUtil::JulianToGMST (  double  juliandate,
double &  gmst
) 
 

Definition at line 28 of file AstTime.cxx.

References sidereal_time().

Referenced by ANtpInfoObjectFiller::FillHeaderInformation(), and AstValidate::TestJulianDateToSiderealTime().

00028                                                             {
00029   // Static method to convert from julian date (hours) to greenwich
00030   // mean sidereal time (hours)
00031 
00032   double fracjuliandate = fmod(juliandate,1.);
00033   double intjuliandate = juliandate - fracjuliandate;
00034   sidereal_time(intjuliandate,fracjuliandate,0,&gmst); // nova routine
00035  
00036 }

void AstUtil::LSTToGST (  double  lst,
double  longitude,
double &  gst
) 
 

Definition at line 61 of file AstTime.cxx.

00061                                                               {
00062   // Static method to convert from lst to gst (hours) 
00063   // Longitude is expressed in degrees and east of 0^o is +, west -.
00064 
00065   gst = lst - longitude*12./180.; // hours
00066   if ( gst < 0. ) gst += 24.;
00067   if ( gst > 24. ) gst -= 24.;
00068 }

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