Spring Equinox – Vernal Equinox
The Vernal (Spring) Equinox in the Northern Hemisphere is the Autumnal (Fall) Equinox in the Southern Hemisphere and vice versa.
Not Entirely Equal Day & Night
On the equinoxes the Sun shines directly on the equator and the length of day and night is nearly equal – but not quite.
The March equinox marks the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from south to north and vice versa in September.
Vernal Equinox – Northern Hemisphere
(USA, Central America, Canada, Europe, Asia, northern Africa)
March Equinox in Washington DC, District of Columbia, USA is on
Tuesday, March 20, 2018 at 12:15 pm EDT (Change city)
March Equinox in Universal Coordinated Time is on
Tuesday, March 20, 2018 at 16:15 UTC
Vernal Equinox – Southern Hemisphere
(Australia, New Zealand, South America, southern Africa)
September Equinox in Washington DC, District of Columbia, USA is on
Friday, September 22, 2017 at 4:02 pm EDT (Change city)
September Equinox in Universal Coordinated Time is on
Friday, September 22, 2017 at 20:02 UTC
First Day of Spring?
In the Northern Hemisphere, the Vernal (Spring) Equinox marks the first day of astronomical spring. There's also another, more common definition of when the seasons start, namely meteorological definitions, which are based on average temperatures rather that astronomical events.
Vernal & Autumnal Equinox
- Vernal (Spring) Equinox
- Autumnal (Fall) Equinox
- March Equinox
- 10 Facts: March Equinox
- March Equinox Celebrations
- September Equinox
- 10 Facts: September Equinox
- September Equinox Celebrations
- Nearly Equal Night & Day
The Science of Seasons
- What Causes Seasons?
- Earth's Axis Is Tilted
- Meteorological vs. Astronomical Seasons
- What Is a Solar Analemma?