evidence: Variation in Earth’s Axial Tilt and Its Effects on Climate: The Earth’s axial tilt varies between approximately 22.1 and 24.5 degrees over a cycle of about 41,000 years. As the axial tilt changes, the amount of sunlight received by different latitudes and during different seasons also changes. [...] Evidence from ice cores, sediment records, and other proxies supports the idea that changes in Earth’s orbit and axial tilt contribute to the timing and intensity of glacial-interglacial cycles. For example: