Definition of an observer. Definition of an observer.
Angles are in degrees, arcminutes and arcseconds or in decimal degrees.
The height value is in meters. The conversion uses the values in the middle for earth's equatorial radius and polar flattening which may be adjusted to other earth ellipsoids if you like. In the map of tool ObserverMap the red dot reflects your choice. If you experimented with earth ellipsoid parameters you may find it useful to return to the default values by clicking Reset . The conversion works in both directions.