March Equinox - Equal Day and Night, Nearly
March Equinox in Washington DC, District of Columbia, USA is on
Tuesday, March 20, 2018 at 12:15 pm EDT (Change city)
- Sunrise, sunset and day length around March Equinox 2018
- Countdown to March Equinox 2018 in Washington DC, District of Columbia, USA
March Equinox in Universal Coordinated Time is on
Tuesday, March 20, 2018 at 16:15 UTC
- Local times for March Equinox 2018 worldwide
- Day and Night map for March Equinox 2018
- Equinoxes and solstices from 2000–2049
The Sun Crosses the Equator
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. This happens on March 19, 20, or 21 every year.
Northern Spring – Southern Fall
Equinoxes and solstices are opposite on either side of the equator, and the March equinox is also known as the "spring (vernal) equinox" in the Northern Hemisphere and as the "autumnal (fall) equinox" in the Southern Hemisphere.
On the equinox, night and day are nearly the same length – 12 hours – all over the world. This is the reason it's called an “equinox”, derived from Latin, meaning "equal night." However, in reality, equinoxes don't have exactly 12 hours of daylight.
What Happens on the Equinox?
The Earth's axis is always tilted at an angle of about 23.4° in relation to the ecliptic plane, the imaginary plane created by the Earth's path around the Sun. On any other day of the year, either the Southern Hemisphere or the Northern Hemisphere tilts a little towards the Sun. But on the two equinoxes, the tilt of the Earth's axis is perpendicular to the Sun's rays, like the illustration shows.
Used to Measure Tropical Year
The March equinox is often used by astronomers to measure a tropical year – the mean time it takes for the Earth to complete a single orbit around the Sun. Also known as a solar year, a tropical year is approximately 365 days, 5 hours, 48 minutes and 45 seconds long.
The time between one March equinox and the next can vary by only a few minutes or by as many as 30 minutes each year. For example, the time between the March Equinox in 2015 and the March Equinox in 2016 was 365 days, 5 hours, 44 minutes, and 56 seconds, while the same duration between the March Equinoxes in 2016 and 2017 will be 365 days, 5 hours, 58 minutes, and 36 seconds.
Celebrating New Beginnings
The March equinox has long been celebrated as a time of rebirth in the Northern Hemisphere. Many cultures celebrate spring festivals and holidays around the March equinox, like Easter and Passover.
The Snake of Sunlight
One of the most famous ancient Spring equinox celebrations was the Mayan sacrificial ritual by the main pyramid at Chichen Itza, Mexico.
The main pyramid – also known as El Castillo – has four staircases running from the top to the bottom of the pyramid's faces, notorious for the bloody human sacrifices that used to take place here.
The staircases are built at a carefully calculated angle which makes it look like an enormous snake of sunlight slithers down the stairs on the day of the equinox.
Knowledge of the equinoxes and solstices is also crucial in developing dependable calendars, another thing the Mayans clearly had got the hang of.
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
Winter & Summer Solstices
- What Is the June Solstice?
- June Solstice Facts
- What Is the December Solstice?
- December Solstice Facts
- When Is the Summer Solstice?
- When Is the Winter Solstice?
- June Solstice Celebrations
- December Solstice Celebrations
Create Calendar With Holidays
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- Revised Julian Calendar
- Mayan Calendar