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Signed-off-by: Mattias Andrée <m@maandree.se>

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+.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)