I doubt that @Hypalaser . Did you forget to kill a mechanical boss? There's a 1/20th chance each day for an eclipse to spawn, once a mechanical boss has been killed. 500 hours is 30,000 ingame hours, which amounts to 1250 ingame days. For the 5% chance to fail on every single one of those days is such an astronomically low number - 1.42727156e-28.
i had to wait 500+ hours in one spot the whole time in terraria for a solar eclipse and none came