| 1 |
– |
/* |
| 2 |
– |
|
| 1 |
|
#ifndef lint |
| 2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
| 2 |
> |
static const char RCSid[] = "$Id$"; |
| 3 |
|
#endif |
| 4 |
+ |
/* |
| 5 |
|
* SOLAR CALCULATIONS |
| 6 |
|
* |
| 7 |
|
* 3/31/87 |
| 8 |
|
* |
| 9 |
|
*/ |
| 10 |
|
|
| 11 |
< |
#define PI 3.141592654 |
| 11 |
> |
#include <math.h> |
| 12 |
> |
#include "sun.h" |
| 13 |
|
|
| 14 |
+ |
#ifdef M_PI |
| 15 |
+ |
#define PI M_PI |
| 16 |
+ |
#else |
| 17 |
+ |
#define PI 3.141592653589793 |
| 18 |
+ |
#endif |
| 19 |
+ |
|
| 20 |
|
double s_latitude = 0.66; /* site latitude (radians) */ |
| 21 |
|
double s_longitude = 2.13; /* site longitude (radians) */ |
| 22 |
|
double s_meridian = 2.0944; /* standard meridian (radians) */ |
| 23 |
|
|
| 24 |
|
|
| 25 |
|
int |
| 26 |
< |
jdate(month, day) /* Julian date (days into year) */ |
| 27 |
< |
int month, day; |
| 26 |
> |
jdate( /* Julian date (days into year) */ |
| 27 |
> |
int month, |
| 28 |
> |
int day |
| 29 |
> |
) |
| 30 |
|
{ |
| 31 |
|
static short mo_da[12] = {0,31,59,90,120,151,181,212,243,273,304,334}; |
| 32 |
|
|
| 35 |
|
|
| 36 |
|
|
| 37 |
|
double |
| 38 |
< |
stadj(jd) /* solar time adjustment from Julian date */ |
| 39 |
< |
int jd; |
| 38 |
> |
stadj( /* solar time adjustment from Julian date */ |
| 39 |
> |
int jd |
| 40 |
> |
) |
| 41 |
|
{ |
| 33 |
– |
double sin(); |
| 34 |
– |
|
| 42 |
|
return( 0.170 * sin( (4*PI/373) * (jd - 80) ) - |
| 43 |
|
0.129 * sin( (2*PI/355) * (jd - 8) ) + |
| 44 |
|
12 * (s_meridian - s_longitude) / PI ); |
| 46 |
|
|
| 47 |
|
|
| 48 |
|
double |
| 49 |
< |
sdec(jd) /* solar declination angle from Julian date */ |
| 50 |
< |
int jd; |
| 49 |
> |
sdec( /* solar declination angle from Julian date */ |
| 50 |
> |
int jd |
| 51 |
> |
) |
| 52 |
|
{ |
| 45 |
– |
double sin(); |
| 46 |
– |
|
| 53 |
|
return( 0.4093 * sin( (2*PI/368) * (jd - 81) ) ); |
| 54 |
|
} |
| 55 |
|
|
| 56 |
|
|
| 57 |
|
double |
| 58 |
< |
salt(sd, st) /* solar altitude from solar declination and solar time */ |
| 59 |
< |
double sd, st; |
| 58 |
> |
salt( /* solar altitude from solar declination and solar time */ |
| 59 |
> |
double sd, |
| 60 |
> |
double st |
| 61 |
> |
) |
| 62 |
|
{ |
| 55 |
– |
double sin(), cos(), asin(); |
| 56 |
– |
|
| 63 |
|
return( asin( sin(s_latitude) * sin(sd) - |
| 64 |
|
cos(s_latitude) * cos(sd) * cos(st*(PI/12)) ) ); |
| 65 |
|
} |
| 66 |
|
|
| 67 |
|
|
| 68 |
|
double |
| 69 |
< |
sazi(sd, st) /* solar azimuth from solar declination and solar time */ |
| 70 |
< |
double sd, st; |
| 69 |
> |
sazi( /* solar azimuth from solar declination and solar time */ |
| 70 |
> |
double sd, |
| 71 |
> |
double st |
| 72 |
> |
) |
| 73 |
|
{ |
| 66 |
– |
double sin(), cos(), atan2(); |
| 67 |
– |
|
| 74 |
|
return( -atan2( cos(sd)*sin(st*(PI/12)), |
| 75 |
|
-cos(s_latitude)*sin(sd) - |
| 76 |
|
sin(s_latitude)*cos(sd)*cos(st*(PI/12)) ) ); |
