Babylon: Mercury was created after the Moloch period also collapsed. Babylon was so degenerated and powerful that they managed to burn out their new sun and had to recreate it even before their period ended, the second Babylonian sun was Pluto.

Atlantis: Having again learned nothing, humanity created Venus to serve as the new garbage disposal unit. Venus lasted up until anon's recalled past life memories ending in the 3 days of darkness. The original sun was then restored by said aliens before leaving.

This is where our period comes in. We had Saturn as the sun up until the end of the 1800s. If you look at old paintings you can see they have a purple light. That is because Saturn when burning gives off a more beneficial light than the yellow fake sun later created.