Page:Michelson1904.djvu/4

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v is the velocity of the earth in its orbit, R the radius of earth's orbit, and δ the sun's declination.

If A=10×10 kilometres,

v/V=10-4,		R=1.5 x 1011,		λ=5x10-7,
sin φ=0.7,		cos δ=1,		then Δ=O.37.

To obtain this displacement would require a circuit 40 kilometres in length.