Climatic cycles

Long-term weather patterns and periodic ice ages may be influenced by slow oscillations in Earth's orbit and axis tilt. These astronomical factors create a roughly 40,000-year cycle of climatic changes.
 Milutin Milankovitch Serbia 1920 Climatic cycles

Long-term weather patterns and periodic ice ages may be influenced by slow oscillations in Earth's orbit and axis tilt. These astronomical factors create a roughly 40,000-year cycle of climatic changes.