Hello, today March 20 the first day of the astronomical spring. Today also observed a partial solar eclipse in Poland, in Wielowieś 10 – 12 am. The theme of my previous article was just an interesting and mysterious astronomical phenomenon.
I enclose a few photographs taken before sunset yesterday and today during a solar eclipse. All those who are interested in my website cordially greet.
Have a nice weekend and a nice spring weather – admin.
Spring – one of the four main seasons in nature, in the temperate climate zone. It is characterized by moderate air temperatures with increasing mean daily, and a moderate amount of precipitation. Vernal Equinox – on the side of the world – north or south – is the equinox, the sun after the occurrence of six months will illuminate harder this hemisphere and less hemisphere to another. The moment of the vernal equinox on a given hemisphere determines the beginning of astronomical spring.
The first day of spring, is celebrated on the day of the vernal equinox, which usually falls on March 21 or the previous day or the next, depending on where it is observed. In the twentieth century, spring time zone Polish usually began on March 21, and as it moves into the end of the century increasingly March 20. In 2011, the first day of spring fell on March 21 (h. 00:21), and all subsequent to the year 2043 will be celebrated only on March 20, and from 2044 years – 19 or 20 March. Another beginning of spring on March 21, will take place only in the 2102nd phenomenon is caused by the movement of the point of Aries associated with the precession of the Earth’s axis of rotation.
Astronomical spring begins at the moment of the vernal equinox and lasts until the summer solstice, which roughly means the Northern Hemisphere period between 20 March and 22 June (sometimes these dates fall the day before or the day after, in a leap year may additionally be undone by one day ). During the spring time of day of the astronomical day is longer than night-time, and also with each additional day the day is longer, nights shorter, until the summer solstice, from that day on the days get shorter and the nights longer. The air temperature in the spring rarely below 0 ° C.
For spring climate is a period of the year in which the average daily temperature range between 5 and 15 
° C. Basically spring precedes winter, but between these periods is climatically transitional stage – early spring. The beginning of spring phenological accepted beginning of vegetation and flowering snowdrops and crocuses. Depending on the continent and climatic zone, seasons change sooner or later and last longer, or shorter.
For all described in the southern hemisphere dates and events are shifted by half a year. For the months of spring in the northern hemisphere is considered to March, April and May, and on the south of September, October and November.
So the northern hemisphere spring equinox (the March) is the point at which the Earth than the point on its orbit, where the sun shines perpendicular to the equator and are simultaneously tangent to the surface at the poles, and from now on for half a year will be closer to the North Pole Sun than the South Pole (Sun illuminates the northern hemisphere more Earth). In other words, the spring equinox in the northern hemisphere is the moment of intersection of the celestial equator by the Sun during its apparent wandering along the ecliptic from the southern hemisphere to the northern hemisphere.
In the old Roman calendar, the spring equinox was the beginning of the year (month Martius). In 155 BC Rome postponed the official beginning of the year on January 1st.
In 325 N.E. spring equinox fell down on March 21 and the term was adopted by the Council of Nicaea to calculate the date of Easter ordination. The inaccuracy of the Julian calendar meant that in the sixteenth century. Equinox moved on March 11. As a result of the introduction of the Gregorian calendar in 1582 and miss the 10 days, the term equinox falls constantly in and around March 21.
In ancient Mesopotamia, the ceremony celebrated the harvesting of cereals. This feast was called Akitu. Celebrations New Year celebrated in most cities of ancient Mesopotamia. When Marduk stood between them and Ashur Akitu gained new importance as a national holiday, celebrated at the beginning of the year in the capital with the participation of the king and court and priestly elites.
Tekst źródło : pl.wikipedia.org , zdjęcia : własne oraz pl.wikipedia.org