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 Equator is an imaginary line around the middle of the Celestial Sphere, equidistant from the NCP and SCP and on the same plane as the earth's equator. It intersects the Circle of the Horizon at East and due West. star 15Â°s above the Western horizon on the Celestial Equator will take one hour to reach the Western horizon and set. At the vernal point, the sun is near the constellation of Pisces on the Celestial Sphere. Stars in this constellation have a RA near 0. Omega Piscium, for example, has an RA of 23h 59m, almost at 0.