Curren Environmental Blog

When is the first dayof Spring?

Posted by Tiffany Byrne on Mar 8, 2016 9:00:00 AM

Why does the 1st day of Spring Start on March 19th?

What is the first day of spring?  Well, naturally it means the flowers are supposed to bloom, the day is longer, the weather gets warmer and the rain never stops.  Astronomically speaking, it is when the equinox occurs when the Sun crosses the celestial equator on its way north along the ecliptic.   

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In the years 2008 and 2012, those living in Alaska, Hawaii and the Pacific, Mountain and Central Time Zones on March 19. And in 2016, it if you are in California it will start on March 19, for the Eastern states it will be on March 20th at 12:30 AM.

There are a few reasons why seasonal dates can vary from year to year.

A year is not an even number of days and neither are the seasons. To try and achieve a value as close as possible to the exact length of the year, our Gregorian Calendar was constructed to give a close approximation to the tropical year which is the actual length of time it takes for the Earth to complete one orbit around the Sun. It eliminates leap days in century years not evenly divisible by 400, such 1700, 1800, and 2100, and millennium years that are divisible by 4,000, such as 8000 and 12000.

Another reason is that the Earth's elliptical orbit is changing its orientation relative to the Sun (it skews), which causes the Earth's axis to constantly point in a different direction, called precession. Since the seasons are defined as beginning at strict 90-degree intervals, these positional changes affect the time Earth reaches each 90-degree location in its orbit around the Sun.

The pull of gravity from the other planets also affects the location of the Earth in its orbit.

So Spring doesn’t start on March 21st not even March 20th for the western and mid-western states. Find your date and mark your calendars for the first day of spring! Get the garden tools out, check the lawn mower and prepare your cleaning supplies a day earlier.  Also, check your downspouts and make sure there is proper drainage that slopes the ground away from the foundation of your house or dwelling to ensure no water or moisture gets in to prevent against indoor mold.

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