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Hubble Constant

H = \frac{v}{d}, the proportionality constant relating the recession velocity of a galaxy to its distance, crucial for measuring the expansion rate.
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The statement of the theorem

Define the Hubble parameter H(t)H(t) as the proportionality constant relating the recession velocity vv of a galaxy to its distance dd via Hubble's Law:\nv(t)=H(t)d(t)v(t) = H(t) d(t) \nWhere v(t)=dotaad(t)v(t) = \frac{\text{dot{a}}}{\text{a}} d(t) is the recession velocity, and a(t)a(t) is the scale factor of the universe.
Source: Wikipedia