Do you have any sources to back up any of these assertions, e.g. that this is what Sumerians called 'Nibiru', or that they had astronomical records of this/an object?
If I remember correctly, the "Planet X" / "Nibiru" stuff is largely tinfoil-hat territory (see the link dalke posted, as well as other articles [1-4]) - a hodgepodge of speculation, conspiracy theories, pseudoscience and -history, and literal interpretation of myths - as made evident by a cursory search on Wikipedia.
Planet Nine, though, seems to be something other [5] than this mess entirely.
As for the doomsday myths, I find them equally ridiculous whether the planet in question would be number 9 or 10 on our somewhat arbitrary planet-system.
Clearly all the evidence for the Sumerians, Lumerians and Brobdingnagians knowledge of Nibiru was covered up by the knights Templar in order to hide the fact the world is going to end next Wednesday afternoon just after the Sleestaks take over.
If I remember correctly, the "Planet X" / "Nibiru" stuff is largely tinfoil-hat territory (see the link dalke posted, as well as other articles [1-4]) - a hodgepodge of speculation, conspiracy theories, pseudoscience and -history, and literal interpretation of myths - as made evident by a cursory search on Wikipedia.
Planet Nine, though, seems to be something other [5] than this mess entirely.
As for the doomsday myths, I find them equally ridiculous whether the planet in question would be number 9 or 10 on our somewhat arbitrary planet-system.
[1]: https://en.wikipedia.org/wiki/Planets_beyond_Neptune
[2]: https://en.wikipedia.org/wiki/Mesoamerican_Long_Count_calend...
[3]: https://en.wikipedia.org/wiki/2012_phenomenon
[4]: https://en.wikipedia.org/wiki/Zecharia_Sitchin
[5]: https://en.wikipedia.org/wiki/Planet_Nine