Doppler effect examples
Car with horn blowing, moving away from you at 70 MPH.
Speed of sound is ~700 MPH = 1000 ft/sec
Original horn pitch is 200 cycles/sec o ~ 5 ft
Star moving toward you at 200 km/sec = 2.0105 m/s
Speed of light c = 3.00 108 m/s
Original H   o= 0.65647 m