Hi,
I just tried an idea I had which was the following:
* Unix time represents the current time in seconds since 00:00:00 UTC,
January 1, 1970.
* There are 86400 seconds in a day
By combining these tow I can get the normalized UTC time-of-day (ranging
from 0.0 .. 1.0) at lat/lon (0.0 , 0.0) using the following code:
time_t t = time(NULL);
double tod = (t / 86400.0);
double daytime = fmod(tod, 1.0);
Given that 12.00 UTC is high noon and 0.00 is midnight it is now easy to
determine the sun azimuth for (0,0) by using the following formula:
double azimuth = -90.0 + 180 * daytime.
Now you only need to adjust it for timezone, lat and lon.
Is this correct or am I missing something?
Erik
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