When was the first measurement of the Hubble constant made?

In 1929, Edwin Hubble published evidence that galaxies are moving away from one another, with speed proportional to distance. This relation became known as Hubble’s law and led to the idea that the universe is expanding. The value he estimated for the expansion rate, now called the Hubble constant, was much larger than modern measurements because the cosmic distance scale was not yet well understood. Even so, Hubble’s work was a turning point in cosmology.