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.
Celestial equator-the imaginary line encircling the sky midway between the two celestial poles. Celestial poles-the imaginary points on the sky where Earth 's rotation axis, extended infinitely, would touch the imaginary celestial sphere ...t's anchored to the celestial poles and the ~ (directly above Earth 's equator). Declination and right ascension are the celestial equivalents of latitude and longitude. Declination-Similar to latitude on the Earth 's surface. The distance in degrees north or south of the ~ (similar to the Earth 's Equator).