Doppler we can measure Red/Blue and !!! Intensity shift !!!

http://youtu.be/fT-D-J2HmDs

more simple explain
http://youtu.be/PNYiejnl0t0

Perpendicular test version
https://www.youtube.com/watch?v=VY625g-0Qd8

Gravitation and apparent distance problem !!!
http://youtu.be/DUW3zDAUksc