Articles About Equinox (19)
At the March equinox, the Sun crosses the equator from south to north. Explanation and 2023 equinox date.
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; in the Southern Hemisphere, it starts in March. Find out exact dates and how the fall season is defined.
Equinoxes and Solstices
Equinoxes and solstices are a result of Earth’s tilt and its orbit around the Sun.
2022 Cosmic Calendar
Celestial events and highlights of 2022 including supermoons, solar and lunar eclipses, meteor showers, solstices, and equinoxes.
The Gregorian Calendar
The Gregorian calendar is the internationally accepted civil calendar that was first adopted in 1582.
What Causes Seasons on Earth?
Seasons change because Earth's rotational axis tilts away or towards the Sun during the course of a year.
Gregorian Calendar Reform: Why Are Some Dates Missing?
The Gregorian calendar was introduced in 1582 in some countries. The US, Canada, and the UK changed in 1752. Why were some days skipped?
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 Sept Equinox Facts
10 things you may not know about the September Equinox.
March: Worm Moon
The Full Moon in March is the Worm Moon, but if it occurs on or after March 21 it is also the Paschal Moon. It's also called Lenten, Crow, Crust, Chaste, Sugar, and Sap Moon.
March Equinox Facts
On March 20, 2023, day and night are of almost equal duration in most time zones in 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.