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'''General Reference''' is a category of work that provides the widest possible '''frame of reference''' for The [[Nordan Symposia]].  

'''General Reference''' is a category of work that provides the widest possible '''frame of reference''' for The [[Nordan Symposia]].  

A '''frame of reference''' is a particular [[perspective (visual)|perspective]] from which the [[universe]] is observed.  

A '''frame of reference''' is a particular [[perspective (visual)|perspective]] from which the [[universe]] is observed.  

There are two types of reference frames: [[inertial reference frame|inertial]] and [[non-inertial reference frame|non-inertial]]. An inertial frame of reference is defined as one in which [[Newton's first law]] holds true. That is, one in which a [[free particle]] travels in a [[straight line]] (or more generally a [[geodesic]]) at constant [[speed]]. In three dimensional [[Euclidean space]], using [[Cartesian co-ordinates]].

There are two types of reference frames: [[inertial reference frame|inertial]] and [[non-inertial reference frame|non-inertial]]. An inertial frame of reference is defined as one in which [[Newton's first law]] holds true. That is, one in which a [[free particle]] travels in a [[straight line]] (or more generally a [[geodesic]]) at constant [[speed]]. In three dimensional [[Euclidean space]], using [[Cartesian co-ordinates]].