.TH LIBTELLURIAN_AZIMUTHAL_RADIUS 3 libtellurian
.SH NAME
libtellurian_azimuthal_radius \- Calculate a azimuthal radius of curvature

.SH SYNPOSIS
.nf
#include <libtellurian.h>

double libtellurian_azimuthal_radius(double \fIlatitude\fP, double \fIazimuth\fP);

double libtellurian_azimuthal_radius_radians(double \fIlatitude\fP, double \fIazimuth\fP);
.fi
.PP
Link with
.I -ltellurian
.IR -lm .

.SH DESCRIPTION
The
.BR libtellurian_azimuthal_radius ()
function calculates the Earth's azimuthal radius of
curvature at a given
.I latitude
for a given
.IR azimuth ,
that is, the radius of curvature along the normal
section in the direction of the
.I azimuth
at the specified
.I latitude.
.PP
The
.I latitude
shall be specified according to GPS and in degrees,
likewise, the
.I azimuth
shall be specified in degrees.
.PP
The
.BR libtellurian_azimuthal_radius_radians ()
function is identical to the
.BR libtellurian_azimuthal_radius ()
function except that
.I latitude
and
.I azimuth
shall be specified in radians.

.SH RETURN VALUE
The
.BR libtellurian_azimuthal_radius ()
and
.BR libtellurian_azimuthal_radius_radians ()
functions return the radius of curvature
measured in meters.

.SH ERRORS
None.

.SH SEE ALSO
.BR libtellurian (7)