The following reading is the long explanation of relativity, as written in
conceptual terms by Albert Einstein.

Light is not subject to relative
measurement of its speed, moving at constant, but subject to differing rates of
spatial travel through relative mediums.

The movement of the observer
determines the speed the object moving will be measured at -- Relative Time
Simplified.

Relative time, is dependent on the apparent distance a thing
travels to. Object A falls towards the earth, and its movement can be measured
at different angles, and the observers distance from the phenomena, both
determining the relative time the object reaches its position as observed. --
Relative Time Simplified.

Relative position, is determined by place
specifications. Object a, is x far away from any other object, thus its position
is relative. -- Position Relativity Simplified.

Simultaneity -- when two
events seem to occur at the same time, simultaneous, as seen by an observer.
http://youtu.be/DcZSxfFJ2mg