Earth-axis tilt, axis wobble, and orbit cycles change sunlight amount that falls on Earth, in an overall cycle that caused Ice Ages {Milankovich model}. Earth-axis tilt cycles over 90,000 to 100,000 years. Earth axis wobble has a 39000-year to 42000-year cycle. Earth orbital path has a 17000-year to 21000-year cycle. Summer in Northern Hemisphere can be when Earth is closest to Sun, making hotter land temperatures.
Physical Sciences>Earth Science>Planet>Temperature History
5-Earth Science-Planet-Temperature History
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224