Sunday, 18 March 2018

The March Equinox.

The March Equinox falls at 4.15 pm on Tuesday 20 March this year. The Earth spins on its axis at an angle to the plain of the Solar System. This means that the poles of the Earth do not remain at 90° to the Sun, but rather the northern pole is tilted towards the Sun for six months of the year (the northern summer), and the southern pole for the other six months (the southern summer). This means that twice a year neither pole is inclined towards the Sun, on days known as the equinoxes.

The tilt of the Earth relative to the incoming light of the Sun at the March Equinox. Przemyslaw Idzkiewicz/Wikimedia Commons.

The equinoxes fall each year in March and September, with the March Equinox being the Spring (or Vernal) Equinox in the Northern Hemisphere and the Autumn Equinox in the Southern Hemisphere, while the September Equinox is the Autumn Equinox in the Northern Hemisphere and the Spring Equinox in the Southern Hemisphere. On these two days the day and night are both exactly twelve hours long at every point on the planet, the only days on which this happens.

 The tilt of the Earth relative to the Sun at the planet's equinoxes and solstices. Astronomy Group/University of St Andrews.

See also...

http://sciencythoughts.blogspot.co.uk/2018/03/neptune-reaches-solar-conjunction.htmlhttp://sciencythoughts.blogspot.co.uk/2018/02/partial-solar-eclipse-to-be-visible.html
http://sciencythoughts.blogspot.co.uk/2018/01/total-lunar-eclipse-on-31-january-2018.htmlhttp://sciencythoughts.blogspot.co.uk/2017/12/earth-approaches-perihelion.html
http://sciencythoughts.blogspot.co.uk/2017/12/the-december-solstice.htmlhttp://sciencythoughts.blogspot.co.uk/2017/12/saturn-reaches-solar-conjunction.html
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