The months comprising "fall" depend on whether you are using a scientific, calendar-based, or geographic definition. Most people in the Northern Hemisphere recognize fall as , but the exact dates vary based on whether you follow the sun or the weather. 1. Two Ways to Define the Season

Fall (also called autumn) occurs at different months depending on whether you use the astronomical or meteorological definition, and on which hemisphere you’re in.

It is important to remember that the seasons are reversed in the Southern Hemisphere (countries like Australia, New Zealand, and parts of South America and Africa). Because the Earth is tilted, when the Northern Hemisphere is tilted toward the sun (summer), the Southern Hemisphere is tilted away (winter).

In the , meteorological fall is:

Everything above applies to the (North America, Europe, most of Asia, northern Africa). Because the Earth’s hemispheres experience opposite seasons, the fall months in the Southern Hemisphere are reversed: