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authorMattias Andrée <maandree@kth.se>2019-10-06 14:54:42 +0200
committerMattias Andrée <maandree@kth.se>2019-10-06 14:54:42 +0200
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Signed-off-by: Mattias Andrée <maandree@kth.se>
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-.TH LIBRED_SOLAR_ELEVATION 3 LIBRED
-.SH NAME
-libred_solar_elevation \- Calculate the Sun's apparent elevation
-.SH SYNOPSIS
-.nf
-#include <libred.h>
-
-double \fBlibred_solar_elevation\fP(double \fIlatitude\fP, double \fIlongitude\fP);
-.fi
-.PP
-Link with
-.IR -lred .
-.SH DESCRIPTION
-.B libred_solar_elevation
-calculates the Sun's elevation as apparent from a select 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 function sets
-.B errno
-to 0 and returns the Sun's current apparent elevation, measured in
-degrees above the horizon. On failure, the function returns an
-arbitrary value (happens to always be 0.0) and sets
-.B errno
-an a non-zero value.
-.SH ERRORS
-The function may fail for any reason specified for
-.BR clock_gettime (3),
-and set the value of
-.B errno
-to the same values.
-.B errno
-is always set to 0 on success.
-.SH "FUTURE DIRECTIONS"
-None.
-.SH "SEE ALSO"
-.BR libred.h (0),
-.BR libred (7),
-.BR libred_check_timetravel (3),
-.BR libred_init_colour (3)