Precession is a phenomenon that results from the planet’s changing tilt. You can think of it as a kind of wobbling effect. About 12,900 years from now, the North Pole will be tilted toward the Sun in January and away from it in June. This means that the winter season in the North will occur during the months that are now considered summer (late June through early September) and summer will occur from January through March. This change will be gradual over time, and no one alive today or for many generations will be aware of it.