I've been following the Nancy/Zeta saga for a while and am continually amazed and dismayed at the lack of basic astronomical understanding of so many people. I appreciate the effort done by many debunkers to explain the true cause of the Planet X sightings. I thought of a few more ways to demonstrate that the Earth has been unaffected.
1) Star trails near the astronomical north pole - One of the first pictures any budding astro-photographer takes is long exposure shot near Polaris to show star trails. If the Earth has tipped, such a shot would very easily show how much tipping has taken place. Anyone have a link to a recent photograph of that nature?
2) Sundials would not properly work. If the sun were really rising "too far North" (a current hot Planet X proof on GLP), then the sundial would not show the correct time. It is more complicated that just comparing your watch to the time indicated on the sundial. You need to know that the gnomon is angled properly to begin with, and if the hour lines have been adjusted to take into account your location within your time zone.