Home| imagery |src.lib|sza| SZAEqOfTime Index

SZAEqOfTime

Syntax
double SZAEqOfTime(double lon,int yr);
Header
imagery/sza.h
Library
sza
Description

The SZAEqOfTime function calculates the Equation of Time for a given longitude and year.

The mean solar longitude is given by the argument lon and the year by the argument yr.

Returns
Returns the calculated value for the Equation of Time.
Errors
None
Example

Source Code: SZAEqOfTime.c

/* SZAEqOfTime.c
   =============
   Author: R.J.Barnes
 Copyright (c) 2012 The Johns Hopkins University/Applied Physics Laboratory

This file is part of the Radar Software Toolkit (RST).

RST is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

Modifications:

*/


#include <stdio.h>
#include <stdlib.h>
#include "sza.h"


int main(int argc,char *argv[]) {

  int yr,mo,dy,hr,mt,sc;
 
  double dec,eqt;

  yr=2002;
  mo=8;
  dy=30;
  hr=10;
  mt=0;
  sc=0;


  dec=SZASolarDec(yr,mo,dy,hr,mt,sc);
  eqt=SZAEqOfTime(yr,mo,dy,hr,mt,sc);



  fprintf(stdout,"SZAEqOfTime'n");
  fprintf(stdout,"Time: %.4d-%.2d-%.2d %.2d:%.2d:%.2d'n",yr,mo,dy,hr,mt,sc);

  fprintf(stdout,"Output: Equation of Time=%g'n",eqt);
  return 0;
}