The March Equinox and the Beginning of Spring!
The March Equinox will occur on the 20th. This also marks the beginning of Spring in the Northern Hemisphere. (On a somewhat related note, it’s been fascinating to see the changing pattern on the World Sunlight Map. )
The word “equinox” derives from the Latin words meaning “equal night” and refers to the time when the sun crosses the equator. At such times, day and night are everywhere of nearly equal length everywhere in the world.
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The March equinox is the movement when the sun crosses the true celestial equator – or the line in the sky above the earth’s equator – from south to north, around March 20 (or March 21) of each year. At that time, day and night are balanced to nearly 12 hours each all over the world and the earth’s axis of rotation is perpendicular to the line connecting the centers of the earth and the sun.
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During the equinox, the length of night and day across the world is nearly, but not entirely, equal. This is because the day is slightly longer in places that are further away from the equator, and because the sun takes longer to rise and set in these locations. Furthermore, the sun takes longer to rise and set farther from the equator because it does not set straight down - it moves in a horizontal direction.
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Moreover, one day does not last for the exact same 24 hours across the world and due to time zone differences, there could be a small difference in the daylight length between a far-eastern and far-western location on the same latitude, as the sun moves further north during 24 hours….
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The vernal equinox occurs in the spring while the autumnal equinox occurs during fall (autumn). These terms are derivatives of Latin. It is important to note that the northern hemisphere’s vernal equinox is in March while its autumnal equinox is in September. In contrast, the southern hemisphere’s vernal equinox is in September and its autumnal equinox is in March.
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The days here have been warmer and sunnier the past week, which I appreciate. The birds have been much more vocal and our mimosa tree is showing the first hint of buds. Allergies aside I can’t think of any reason to not celebrate the beginning of Spring.














March 18th, 2010 at 4:08 pm
Actually today marks the REAL equinox. 12 hours of darkness, 12 hours of daylight.