Post-concussion syndrome. Post-concussion syndrome, also known as postconcussive syndrome or PCS, is a set of symptoms that may continue for weeks, months, or a year or more after a concussion â a mild form of traumatic brain injury (TBI).
The Equatorial (Celestial) Coordinate System. Equatorial coordinates, also called simply celestial coordinates, are the standard coordinate system for the sky. It is meant for the fixed sphere of the stars within which the Earth and Sun move.
The celestial sphere for observers in Seattle and any other observer at the same latitude (47Â° N) on the Earth is shown above. For another more detailed example, let's choose Los Angeles at latitude 34Â° N. The NCP is therefore 34 degrees above the north horizon.