Welcome, 

"As time goes by everything sits or moves in the absolute 3D space":

abs. space time diagram.jpg: shows the abs time and abs space  axis 

moving material points.jpg: shows moving material point at different speeds

moving ruler.jpg: How appears in the diagram a moving ruler

simultaneity line.jpg: Relativistic simultaneity line T=1

composite speeds.jpg: Shows how the Esyncronization of the clocks laying on the moving ruler determine the relativistic composition of speeds (.5+.5=.8)

relativistic two way path.jpg: Shows the two ways (forth and back) relativistic paths for light and for a moving object  

absolute two way path.jpg: shows the two ways forth and back not relativistic paths for light and for a moving object

local speed as seen from the ruler.jpg: How a observer laying on the moving ruler would measure the "local" speeds of light and of the objects

add speeds.jpg : it shows the composite speed of two rulers moving at .5 C and a object moving on the rulers at the local speed of  .5 C 

SR=ether theory.jpg : it shows how a .5 C moving ruler is sees from a approaching observer at -.5C and the equivalence to a .8 C approaching ruler. Note: there is an error where I say that the absolute simultaneity line is set at T=.75, it is instead at T=.8660254 (the relativistic is set at T= .75). In any case the "local time" on the ruler's clocks, if the clocks are absolutely synchronized can be also considered absolute because it differ from the preferred frame absolute time just for a constant ratio.

drawings\how O,O' see the ruler1.JPG: moving observer know their absolute speed from the modified vision of the outer world

Errata corrige of the above: drawings\how O,O' see the ruler1.JPG

reciprocityofmeasurements.htm: how ruler A at .6 C measures ruler B at .8 C and viceversa

images\visual.ruler.at.6C.JPG : the visual length of a ruler as seen from a commoving observer looking in the direction of the movement

images\visual.ruler.at.6C1.JPG : the visual length of a ruler as seen from a commoving observer looking in the opposite direction of the movement

images\how.the.outer.world.is.seen.altered.JPG : the change on the apparent length of the forwards outer world

images\how.the.outer.world.is.seen.altered1.JPG : the change on the apparent length of the backwards outer world

images\visual.clocks.JPG : how a moving clock at .6 C is seen from a stationary clock and vice versa

moving.clocks.htm : moving clocks in the ether

The picture is an attempt to show the paths of a object moving at .5 C in a frame moving its self at .5 C: there are several possible path related to the clock synchro adopted in the frame.

Here there are traced 4 paths: all start from the same origin and return to it after 2 local unit of time:

1)The 1ｰ blue (relativistic) one starts from the origin and go forth at the speed of .8 C meets the middle of the ruler at the time 1.7320508 and reflected back at the speed of 0 C reaching the origin at time 2.30940108.

2)The 2ｰ blue (relativistic) one starts from the origin and go back at the speed of 0 C meets the middle of the ruler at the time .8660254 and reflected forth at the speed of .8 C reaching the origin at time 2.30940108.

3)The 1ｰ pink (absolute) one starts from the origin and go forth at the speed of .75 C meets the middle of the ruler at the time 1.7320508 and reflected back at the speed of .25 C reaching the origin at time 2.30940108.

4)The 2ｰ pink (absolute) one starts from the origin and go back at the speed of .25 C meets the middle of the ruler at the time 1.7320508 and reflected forth at the speed of .75 C reaching the origin at time 2.30940108.

Which one of the two synchro procedures is fit to what really happen when a object is boosted forth and bounced back to the origin in a local time = 2 (abs.2.30940108) after it has hit a moving barrier (barrier speed .5 C) ????????

and why ????

best regards

beda pietanza