NASA's water cycle research missions can be grouped into 3 major categories; Water Cycle, Energy Cycle, and Water and Energy Cycle Missions. By studying each and every variable of Earth's water and energy cycles, As Only NASA Can, a crucial understanding of the water cycle's effect on global climate is currently underway.
Home > Holiday and Occasions > Fall - Autumn > When is the first day of Fall - Autumn 2017? When is the first day of fall 2017? In 2017, fall begins on September 22rd (at 20:02 UTC) for countries in the Northern Hemisphere. The date may be different for you based on what time zone you live in. This chart reflects the UTC time zone. Note: Equinoxes are opposite on each side of the equator.
Click here for more Autumn photos. In the United States and the rest of the northern hemisphere, the first day of the autumn season is the day of the year when the Sun crosses the celestial equator moving southward (on September 22nd or 23rd). This day is known as the Autumnal Equinox.