| 35 |
|
extern double s_longitude; |
| 36 |
|
extern double s_meridian; |
| 37 |
|
/* required values */ |
| 38 |
< |
int month, day; |
| 39 |
< |
double hour; |
| 38 |
> |
int month, day; /* date */ |
| 39 |
> |
double hour; /* standard time */ |
| 40 |
> |
double altitude, azimuth; /* or solar angles */ |
| 41 |
|
/* default values */ |
| 42 |
|
int cloudy = 0; |
| 43 |
|
int dosun = 1; |
| 68 |
|
} |
| 69 |
|
if (argc < 4) |
| 70 |
|
userror("arg count"); |
| 71 |
< |
month = atoi(argv[1]); |
| 72 |
< |
day = atoi(argv[2]); |
| 73 |
< |
hour = atof(argv[3]); |
| 71 |
> |
if (!strcmp(argv[1], "-ang")) { |
| 72 |
> |
altitude = atof(argv[2]) * (PI/180); |
| 73 |
> |
azimuth = atof(argv[3]) * (PI/180); |
| 74 |
> |
month = 0; |
| 75 |
> |
} else { |
| 76 |
> |
month = atoi(argv[1]); |
| 77 |
> |
day = atoi(argv[2]); |
| 78 |
> |
hour = atof(argv[3]); |
| 79 |
> |
} |
| 80 |
|
for (i = 4; i < argc; i++) |
| 81 |
|
if (argv[i][0] == '-' || argv[i][0] == '+') |
| 82 |
|
switch (argv[i][1]) { |
| 127 |
|
|
| 128 |
|
computesky() /* compute sky parameters */ |
| 129 |
|
{ |
| 123 |
– |
int jd; |
| 124 |
– |
double sd, st; |
| 125 |
– |
double altitude, azimuth; |
| 130 |
|
/* compute solar direction */ |
| 131 |
< |
jd = jdate(month, day); /* Julian date */ |
| 132 |
< |
sd = sdec(jd); /* solar declination */ |
| 133 |
< |
st = hour + stadj(jd); /* solar time */ |
| 134 |
< |
altitude = salt(sd, st); |
| 135 |
< |
azimuth = sazi(sd, st); |
| 131 |
> |
if (month) { /* from date and time */ |
| 132 |
> |
int jd; |
| 133 |
> |
double sd, st; |
| 134 |
> |
|
| 135 |
> |
jd = jdate(month, day); /* Julian date */ |
| 136 |
> |
sd = sdec(jd); /* solar declination */ |
| 137 |
> |
st = hour + stadj(jd); /* solar time */ |
| 138 |
> |
altitude = salt(sd, st); |
| 139 |
> |
azimuth = sazi(sd, st); |
| 140 |
> |
} |
| 141 |
|
sundir[0] = -sin(azimuth)*cos(altitude); |
| 142 |
|
sundir[1] = -cos(azimuth)*cos(altitude); |
| 143 |
|
sundir[2] = sin(altitude); |
| 223 |
|
if (msg != NULL) |
| 224 |
|
fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
| 225 |
|
fprintf(stderr, "Usage: %s month day hour [options]\n", progname); |
| 226 |
+ |
fprintf(stderr, " Or: %s -ang altitude azimuth [options]\n", progname); |
| 227 |
|
fprintf(stderr, " Or: %s -defaults\n", progname); |
| 228 |
|
exit(1); |
| 229 |
|
} |
