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 مرحى ومرحى يا ربيع العامِ أشرق فدْتك مشارقُ الأيامِ بعد الشتاء وبعد طولِ عبوسه أرِنا بشاشةَ ثغرِكَ
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09:04 AM March, 22 2018 سودانيز اون لاين
Hassan Farah-جمهورية استونيا
مكتبتى
رابط مختصر مرحى ومرحى يا ربيع العامِ أشرق فدْتك مشارقُ الأيامِ
بعد الشتاء وبعد طولِ عبوسه أرِنا بشاشةَ ثغرِكَ البسّامِ
- الربيع والشاعر ابراهيم ناجي
SPRING EQUINOX 2018: THE FIRST DAY OF SPRING
MARCH EQUINOX DATE | VERNAL EQUINOX
The spring equinox (also called the March equinox or vernal equinox) falls on Tuesday, March 20, 2018, at 12:15 P.M. EDT. This event marks the astronomical first day of spring in the Northern Hemisphere. Enjoy our spring equinox facts, folklore, photos, and more!
The spring equinox always occurs on March 19, 20, or 21.
Year Spring Equinox (Northern Hemisphere)
2018 Tuesday, March 20, at 12:15 P.M. EDT
2019 Wednesday, March 20, at 5:58 P.M. EDT
2020 Friday, March 19, at 11:50 P.M. EDT
WHAT DOES THE MARCH EQUINOX MEAN؟
The word equinox comes from Latin words which literally means “equal night”—aequus (equal) and nox (night).
On the equinox, the length of day and night is nearly equal in all parts of the world.
With the equinox, enjoy the increasing sunlight hours, with earlier dawns and later sunsets. See your personalized Sun rise and set calculator.
Image: On the equinox, Earth’s two hemispheres are receiving the Sun’s rays about equally.
WHAT HAPPENS AT THE MARCH EQUINOX؟
On the March Equinox, the Sun crosses the celestial equator from south to north. It’s called the “celestial equator” because it’s an imaginary line in the sky above the Earth’s equator.
If you were standing on the equator, the Sun would pass directly overhead on its way north.
Equinoxes are the only two times a year that Sun only rises due east and sets due west for all of us on Earth!
While the Sun passes overhead, the tilt of the Earth is zero relative to the Sun, which means that Earth’s axis neither points toward nor away from the Sun. (Note, however, that the Earth never orbits upright, but is always tilted on its axis by about 23.5 degrees.)
After the Spring equinox, the Norther Hemisphere tilts toward the Sun, which is why we start to get longer, sunnier days
SPRING EQUINOX FAQS
Q: IS THE FIRST DAY OF SPRING ALWAYS MARCH 20؟
A: No, it’s not always March 20. And your answer also depends on your definition of the “first day of spring.” Both are accurate; they’re just a different perspective. We’ll explain …
Astronomically speaking, the first day of spring is marked by the spring equinox, which falls on March 19, 20, or 21 every year. The equinox happens at the same moment worldwide, though our clock times reflect a different time zone. And, as mentioned above, this date only signals spring’s beginning in the Northern Hemisphere; it announces fall’s arrival in the Southern Hemisphere.
Interestingly, due to time zone differences, there isn’t a March 21 equinox in mainland U.S. during the entire 21st century! Plus, we won’t see a March 21 in the world again until 2101.
Meteorologically speaking, the official first day of spring is March 1 (and the last is May 31). Weather scientists divide the year into quarters to make it easier to compare seasonal and monthly statistics from one year to the next. The meteorological seasons are based on annual temperature cycles rather than on the position of Earth in relation to the Sun, and they more closely follow the Gregorian calendar. Using the dates of the astronomical equinoxes and solstices for the seasons would present a statistical problem, as these dates can vary slightly each year.
Q: ARE DAY AND NIGHT EQUAL ON THE EQUINOX؟
A: Close. In reality, day and night are not exactly equal at the equinox for two reasons: First, daytime begins the moment any part of the Sun is over the horizon, and it is not over until the last part of the Sun has set. If the Sun were to shrink to a starlike point and we lived in a world without air, the spring and fall equinoxes would truly have ‘equal nights.’
Read about more fun facts in the Almanac Astronomer’s post, “March Equinox Oddities.”
Q: ACCORDING TO FOLKLORE, YOU CAN STAND A RAW EGG ON END ON THE EQUINOX. IS THIS TRUE؟
A: Folklore or not, this egg trick sounded like fun to us. One spring, a few minutes before the vernal equinox, several Almanac editors tried this trick. For a full workday, 17 out of 24 eggs stood standing. Three days later, we tried this trick again and found similar results. Perhaps 3 days after the equinox was still too near. Perhaps the equinox has nothing to do with it. Perhaps we just don’t like to take ourselves too seriously! Try this yourself and let us know what happens.
https://www.almanac.com/content/first-day-spring-vernal-equinoxhttps://www.almanac.com/content/first-day-spring-vernal-equinox
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Hassan Farah
فيس بوك
تويتر
انستقرام
يوتيوب
بنتيريست