Articles About September (12)
About the 12 Months
Why are there 12 months? How long are they, and what do the month names mean?
Defining Seasons
When do seasons begin and end in the two hemispheres?
Astro Events 2025
When, where, and how to see things happening in the sky and space.
September Equinox
The Sun shines directly on the Equator on the September equinox and the length of day and night is nearly equal, but not quite.
When Does Fall Start?
North of the equator, fall begins in September. Find out the exact dates for both hemispheres.
When Does Spring Start?
The first day of spring is at the vernal equinox, when day and night are equal. Find out the exact time and date.
Equinox: Equal Day & Night?
Equinoxes don't have exactly 12 hours of day and night all over the world, like many believe. Such days, called equilux, do occur, but depend on your location.
10 Facts about the September Equinox
10 things you may not know about the September equinox.
The Month of September
September is the ninth month of the year in and has 30 days. It was originally the seventh month of the Roman calendar until 153 BCE.
September: Harvest and Corn Moon
The September Full Moon can be both the Harvest Moon and the Corn Moon. However, around every three years, the Harvest Moon occurs in October.
September Equinox Customs
Folklore, customs, traditions and holidays surrounding the September equinox.
Equinoxes and Solstices
Equinoxes and solstices are a result of Earth鈥檚 tilt and its orbit around the Sun.