The Earth's rotation returns to her normal pace within days of the 12th Planet's passage. In fact, the return occurs faster than a mirror image of the stoppage of rotation, due to the 12th Planet leaving the Solar System at a faster clip than the speed at which it entered. When the 12th Planet enters the Solar System, it begins what is essentially a dive for the Sun. As a repulsion force prevents contact, the 12th Planet in essence ricochets off the Sun, zooming past and on out of the Solar System. Thus, within a day of the passage, the Earth begins to rotate again, and within a day or two has returned to her normal pace or rotation. Nevertheless, during an adjustment period that may last several months or even years, rotation may be a bit erratic. One should not set the clock on a 24 hour day, at least not at first.
Where the Earth found the approach of the 12th Planet creating confusion in her magnetic field, the decades following a passage of the 12th Planet are in the main a mirror image of the decades leading up to the passage. However, the Earth's return to a normal magnetic field state is delayed by several years due to the turnaround and return of the 12th Planet. As we have explained, during the coming passage, the 12th Planet will pass close to the Earth on the first pass, but be on the opposite side of the Sun on the second pass. Nevertheless, by slowing down and hanging around during the turnaround, the 12th Planet continues to magnetically confuse the core of the Earth by being yet another influence the Earth must deal with. Thus, compasses will behave erratically for a number of decades after the passage.
A gloomy atmosphere, with the cloud cover seemingly on the ground, will last for at least two decades and then dissipate over the next several years. Several factors are at play here, causing this situation. First, the atmosphere was in essence torn away during the 12th Planet's passage, and is in a process of rebuilding. Second, volcanoes that erupted during the pole shift continue to burp ash into the atmosphere, creating a dense cloud cover. Even after these volcanoes become inactive, the ash that has been thrown into the atmosphere takes some times to settle. As the atmosphere is thin, it tends to drop any water it picks up rather readily. Clouds, after all, are water vapor, but when clouds cannot waft high they are subject to slow motion and bumping into things that cause condensation. Thus, it seems to be raining continuously, at least in a drizzle.
Vegetation regrows in proportion to the sunlight than manages to work its way though the dense cloud cover. At first, there is only a brave sprout of two, which quickly gets eaten by anything hungry in the vicinity. Due to the damp and cloudy environment, many plant species simply do not appear until the climate changes, and then, activated by the climatic conditions that their DNA has become programmed to react to, the seeds magically sprout. Forests that had been leveled by hurricane winds or burned to the ground during firestorms regrow from seedlings. Within a few decades, young forests have reappeared, as have lush meadows and marshlands. Opportunistic vegetation eventually gets pushed aside as the climate worldwide returns to normal. For hundreds of years, however, the vegetation in any given region may have a different appearance that it will ultimately, due to this type of adjustment.
Wildlife, being mobile, rebounds more readily than the vegetation. Wildlife tends to wander until it finds a hospitable home, and there park until matters improve. Many species will seem extinct, where they are merely decimated in number and staying close to where conditions are optimal. As they regrow in numbers and the habitat improves, they return to their venturesome ways, and thus, to mankind, seem to suddenly reappear. Fish fare better, particularly if ocean going, as the oceans are not traumatized in the same manner that land life is. In fact, due to the increased carbon dioxide in the air after a pole shift, the kelp and other plant life in the ocean thrives, creating a life cycle reaction that benefits ocean life. As man, the great plunderer, has essentially disappeared, species that had almost gone extinct will be on the rebound.