Astronauts are warned to be careful when looking directly at the Earth.
As sometimes the onlooker will begin to see all the mytho-cosmological appearances of the Earth at the same time. (i can't seem to think up a good name for this effect sadly)
Which can induce severe vertigo as well as intense religious awe.
Attempt to have a "filter effect" incorporated in the astronauts visors has failed thus far.