Articles About Equinox (16)
March Equinox
At the March equinox, the Sun crosses the equator from south to north. Explanation and 2025 equinox date.
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 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.
When Does Fall Start?
North of the equator, fall begins in September. Find out the exact dates for both hemispheres.
Equinoxes and Solstices
Equinoxes and solstices are a result of Earth鈥檚 tilt and its orbit around the Sun.
Astro Events 2025
When, where, and how to see things happening in the sky and space.
What Causes Seasons on Earth?
Seasons change because Earth's rotational axis tilts away or towards the Sun during the course of a year.
Earth's Perihelion
Earth's closest approach to the Sun is two weeks after the December solstice is a coincidence and has no special significance.
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.
Astronomical Glossary - Terms & Definitions
What do astronomers really mean when they use those technical terms?
Earth Is Tilted
When an object the size of Mars crashed into the newly formed planet Earth around 4.5 billion years ago, it knocked it over and left it tilted at an angle.
10 Facts about the September Equinox
10 things you may not know about the September equinox.
10 Facts about the March Equinox
On this date, day and night are of almost equal duration around the world.
June Solstice Traditions
In many Northern Hemisphere cultures, the June solstice is associated with holidays, feasts and celebrations.
September Equinox Customs
Folklore, customs, traditions and holidays surrounding the September equinox.
March Equinox Customs
Learn more about the customs, traditions and events surrounding the March equinox.