In A minor
A minor and huge correction in the cosmic constant calcuation and later abandonment:
Einstein decided at the out set to measure a static universe and bypass the problems of vortices, expansion and such. At the time, both Einstein and astronomers agreed that the universe was fixed in size and that the overall space between galaxies did not change. When Hubble proved the universe was expanding this revelation persuaded Einstein to abandon the cosmological constant from his field equations as it was no longer necessary.

a twist of fate