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Do you know about Vernal Equinox?

  • Author:Serena
  • Source:Sunny Glassware
  • Release on:2016-03-24
When does spring start in 2016?
The astronomical spring in the Northern Hemisphere begins on March 20.
The Spring (vernal) equinox in the Northern Hemisphere is also known as the March equinox. It's called the "autumnal (fall) equinox" in the Southern Hemisphere.

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. 

Why is it Called “Equinox”?
Since night and day are nearly exactly the same length - 12 hours - all over the world the event is called the equinox, which in Latin, literally means 'equal night' (equi - equal and nox - night).
In reality though, equinoxes do not have exactly 12 hours of daylight.
Solstices and equinoxes mark key stages in the astronomical cycle of the earth. In a year there are two equinoxes (spring and autumn) and two solstices (summer and winter).
The dates of the equinoxes and solstices aren't fixed due to the Earth's elliptical orbit of the sun. The Earth's orbit around the sun means that in early January, the sun is closest (known as perihelion) and in early July it is most distant (aphelion). 
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