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| -rw-r--r-- | libred_solar_elevation.3 | 40 |
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diff --git a/libred_solar_elevation.3 b/libred_solar_elevation.3 new file mode 100644 index 0000000..9bb4b0a --- /dev/null +++ b/libred_solar_elevation.3 @@ -0,0 +1,40 @@ +.TH LIBRED_SOLAR_ELEVATION 3 LIBRED +.SH NAME +libred_solar_elevation \- Calculate the Sun's apparent elevation +.SH SYNOPSIS +.nf +#include <libred.h> + +int \fBlibred_solar_elevation\fP(double \fIlatitude\fP, double \fIlongitude\fP, double *\felevation\fP); +.fi +.PP +Link with +.IR -lred . +.SH DESCRIPTION +.BR libred_solar_elevation () +calculates the Sun's elevation, and stores it, measured in degrees, in +.IR *elevation , +as apparent from a selected geographical position, namely from +.I latitude +degrees north of GPS's equator and +.I longitude +degrees east of GPS's prime meridian. The function is only +explicitly defined for values between -90 and +90 for +.I latitude +and values between -180 and +180 for and +.IR longitude . +Other values may or may not work, no error is thrown if used. +.SH RETURN VALUE +Upon successful completion, the +.BR libred_solar_elevation () +return 0, on failure it returns -1 and sets +.I errno +to indicate the error. +.SH ERRORS +The function may fail for any reason specified for +.BR clock_gettime (3). +.SH SEE ALSO +.BR libred.h (0), +.BR libred (7), +.BR libred_check_timetravel (3), +.BR libred_get_colour (3) |