| 7 |
|
* |
| 8 |
|
*} |
| 9 |
|
|
| 10 |
+ |
DEG : PI/180; |
| 11 |
+ |
|
| 12 |
|
RLAT = 0.66; {* Site latitude (radians) *} |
| 13 |
|
|
| 14 |
|
RLON = 2.13; {* Site longitude (radians) *} |
| 15 |
|
|
| 16 |
< |
RSM = 120 * PI/180; {* Standard meridian (radians) *} |
| 16 |
> |
RSM = 120 * DEG; {* Standard meridian (radians) *} |
| 17 |
|
|
| 18 |
|
|
| 19 |
|
stadj(jd) {* solar time adjustment (hours) *} |
| 36 |
|
{ sd is solar declination, st is solar time (hours) } |
| 37 |
|
= |
| 38 |
|
asin( sin(RLAT) * sin(sd) - cos(RLAT) * cos(sd) * |
| 39 |
< |
cos(st*PI/12) ) |
| 39 |
> |
cos(PI/12*st) ) |
| 40 |
|
; |
| 41 |
|
|
| 42 |
|
|
| 43 |
|
sazi(sd, st) {* the solar azimuth (radians) *} |
| 44 |
|
{ sd is solar declination, st is solar time (hours) } |
| 45 |
|
= |
| 46 |
< |
-atan2( cos(sd) * sin(st*PI/12), |
| 46 |
> |
-atan2( cos(sd) * sin(PI/12*st), |
| 47 |
|
-cos(RLAT)*sin(sd) - |
| 48 |
< |
sin(RLAT)*cos(sd)*cos(st*PI/12) ) |
| 48 |
> |
sin(RLAT)*cos(sd)*cos(PI/12*st) ) |
| 49 |
|
; |
| 50 |
|
|
| 51 |
|
|
| 52 |
< |
SAZI = sazi(SDEC, STIME) * 180/PI; |
| 52 |
> |
SAZI = sazi(SDEC, STIME) / DEG; |
| 53 |
|
|
| 54 |
< |
SALT = salt(SDEC, STIME) * 180/PI; |
| 54 |
> |
SALT = salt(SDEC, STIME) / DEG; |
| 55 |
|
|
| 56 |
|
SDEC = sdec(JDATE); |
| 57 |
|
|
| 58 |
|
STIME = TIME + stadj(JDATE); |
| 59 |
+ |
|
| 60 |
+ |
HALFDAY = acos(-tan(RLAT)*tan(SDEC)) * (12/PI); |
| 61 |
|
|
| 62 |
|
JDATE = DAY + select(MONTH,0,31,59,90,120,151,181,212,243,273,304,334); |
