The day of the vernal equinox
20 Mar 2015 - 11:55:22
Added: Millennium
Spring equinox (Vernal Equinox) — one of the most unique natural phenomena, the essence of which, scientifically speaking, is that "at the time of the equinox the center of the Sun in its apparent motion along the Ecliptic crosses the celestial equator".
In 2015, the vernal equinox occurs on March 20.
Simply put, in this day, the Earth rotates around its imaginary axis passing through the poles, while simultaneously moving around the Sun, is in such position relative to the sun that the sun's rays that carry heat energy fall vertically on the equator.
The sun moves from southern hemisphere to the Northern, and these days in all countries the day is almost night.
Spring and autumn equinoxes are considered to be the astronomical beginning of the respective seasons.
The time interval between two similar equinoxes is called a tropical year.
This year has passed and today for measuring time.
The tropical year is approximately 365,2422 solar day.
That's because of this "about" equinox each year account for different times of day, every year going forward by approximately 6 hours.
Rating: +8
News
Advertising

Rubrics sites


ViP Favorites

Contacts


    WiTop.Ru - this is a popular top ranking site is a service of statistics and a directory of sites ranking on the basis of attendance of resources involved in web and wap ranking Top 100