With "Geographic coordinate system" we only get the location, no rotations or anything. Translated into latitude and longitude.
Where with "Spherical coordinate system", we should be able to get the exact position, including rotations.
The spherical coordinates of a point P are defined as follows:
- the radius or radial distance is the Euclidean distance from the origin O to P.
- the inclination (or polar angle) is the angle between the zenith direction and the line segment OP.
- the azimuth (or azimuthal angle) is the signed angle measured from the azimuth reference direction to the orthogonal projection of the line segment OP on the reference plane.
Now, if I'd want to get my position on Earth with Spherical coords:
- the center of the core of Earth is the origin
- radius from core to sea level + elevation above/below sea level is the radius
- inclination: angle between zenith direction and angle taken from my perspective, vertical point of view (imagine a ray coming out of the center of your pupil)
- azimuth: same as with compass, angle from the North Pole.
P.S. The inclination part wouldn't be correct in this case, because the point is measured exactly on Earth's surface and inclination- from my point of view. But for the idea, that should be enough. (Yes, yes, we can add to radius the distance from "ground" to center of my "pupil" to get the exact point of view in space, while taking the measurements in stature)
As for the gravity attractor thing, that was meant in order to get the position anywhere in the universe. Keeping in mind that it should be measured by using the origin of the center of the nearest, strongest object with a gravitation field in whom you reside.
Are my assumptions correct?
P.S. Please bear with me, I'm not native English speaker. Though, I'm giving my best to chain up all the crazy words/terms (like stature) while not losing the idea what I'm trying to express.
Hope I've made myself clear this time...