  It is generally believed that in the epoch prior to the formation of the
first stars, the Universe was completely dark (the period is therefore known as
the Dark Ages). Usually, the start of this epoch is placed at the photon
decoupling. In this work, we investigate the question, whether there was enough
light during the dark epoch for a human eye to see. We use the black body
spectrum of the Universe to find the flux of photon energy for different
temperatures and compare them with visual limits of brightness and darkness. We
find that the Dark Ages actually began approximately 6 million years later than
commonly stated.
