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| -rw-r--r-- | libtellurian_distance.3 | 38 |
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diff --git a/libtellurian_distance.3 b/libtellurian_distance.3 index 49181b3..d477f53 100644 --- a/libtellurian_distance.3 +++ b/libtellurian_distance.3 @@ -104,6 +104,44 @@ functions do not return any value. .SH ERRORS None. +.SH APPLICATION USAGE +The application should use +.BR libtellurian_azimuth () +or +.BR libtellurian_azimuth_radians () +whenever the distance will not be used by the +application, likewise, if +.I *azimuth1_out +will not be used +.I azimuth1_out +should be set to +.I NULL +and if +.I *azimuth2_out +will not be used +.I azimuth2_out +should be set to +.IR NULL . +Although this currently has almost no impact on +the application, future versions of the library +may select different methods for performing the +calculations depending on what output is enabled. + +.SH NOTES +The (forward) azimuths are defined as the +direction you travelling when you travel +along a great ellipsoid (which is the +shortest distance) from +.RI ( latitude1 ", " longitude1 ) +in the direction of +.RI ( latitude2 ", " longitude2 ). +Hence, +.I *azimuth2_out +will be the direction you would continue +along the great ellipsoid, \m[red]not\m[] +the direction for returning to +.RI ( latitude1 ", " longitude1 ). + .SH SEE ALSO .BR libtellurian (7), .BR libtellurian_coarse_distance (3) |