English: This animation represents a space-time diagram.
The yellow lines represent the worldlines of pulses of light that are emitted at t=0
Usually, space-time diagrams are not represented as animations. The consecutive frames of this animation combined represent a single diagram. In this case that diagram is included as one of the frames of the animation.
The three dark green circles represent a fleet of spaceships. The changes of the dark green circles represent onboard clocks, counting the lapse of proper time. The two light green circles represent miniclocks shuttling back and forth between the ships of the fleet, the miniclocks are used for a procedure to maintain synchronized fleet time.
The ships of the green fleet are 4 units of distance apart. Here, 4 units of distance means that pulses of light take 4 units of time to propagate from one ship to another. In this animation the miniclocks take 5 units of fleet time to travel from one ship to another, so their velocity relative to the fleet is 4/5 the speed of light. During the journey from one ship to another, the miniclocks count 3 units of proper time.
The direction of the fleet as a whole is tilted because this space-time diagram represents how the motion of the green fleet in space-time is mapped with respect the inertial frame of reference of an observer with a velocity of 2/5 the speed of light with respect to the green fleet.
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'''Description:'''<BR> This animation represents a space-time diagram.<BR> The yellow lines represent the worldlines of pulses of light that are emitted at t=0 <BR> Usually, space-time diagrams are not represented as animations. The consecutive frames of