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 Seattle, Washington, USA is on
Thursday, March 19, 2020 at 8:49 pm PDT (Change city)
- Sunrise, sunset and day length around March Equinox 2020
- Countdown to March Equinox 2020 in Seattle, Washington, USA
March Equinox in Universal Coordinated Time is on
Friday, March 20, 2020 at 03:49 UTC
Vernal Equinox – Southern Hemisphere
(Australia, New Zealand, South America, southern Africa)
September Equinox in Seattle, Washington, USA is on
Monday, September 23, 2019 at 12:50 am PDT (Change city)
- Sunrise, sunset and day length around September Equinox 2019
- Countdown to September Equinox 2019 in Seattle, Washington, USA
September Equinox in Universal Coordinated Time is on
Monday, September 23, 2019 at 07:50 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?