labor of our ancestors was mainly associated with farming.In agriculture, many of the works were carried out once in a certain period.Having missed the right moment for processing or seeding, you can stay without a crop.
Farmer planned and performed agricultural work in accordance with the seasons.For him it was very important to determine the time of occurrence of a particular season, especially during the preparation and conduct of sowing.
Before, people did not have a deep knowledge of astronomy and mathematics, so determined, when spring begins at the sun. Long-term observations of planetary motion, the experience ancestors, the analysis of natural phenomena gave good results.The accuracy of determining the seasons grew steadily.
vernal equinox
Astronomers greeted the arrival of spring, the vernal equinox.During this period, the sun leaves the southern hemisphere of the Earth and enters the North.The sun's rays fall vertically to the equator.The day for the duration of the night is equal.Sunrise occurs exactly in the east and sunset - strictly in the west.So arrives astronomical spring in the northern hemisphere and southern hemisphere astronomical autumn comes.
Careful observation of the sky in ancient times came to fruition.Astronomers have learned to accurately determine the number of the vernal equinox for any length of time as in the past and in the future.The period of time from one spring (autumn) equinox before the next is called the tropical year.It is about 365.2422 solar days.Because of the fractional part in the amount of solar day, equinox comes each time in a different time, moving annually 6 hours ahead.
additional day in a leap year to compensate for inaccuracies of the Julian calendar.Gregorian is formed so that the dates of the equinoxes over the years do not change.
time to romantics and lovers
Spring - one of the best seasons for romantic people.The arrival of her happy abundance of light, fresh air and a welcome warming.Nature awakens from hibernation, wake up animals in their burrows and dens, all the vital processes are fuller and more intense.
Spring begins immediately after the end of winter and the arrival of summer.But to determine the number begins with a spring, it is not easy.The fact that in different areas of knowledge are its definition of spring.The following types of concepts:
- calendar;
- astronomical;
- Climate;
- phenological.
calendar spring
Spring - a period of transition.At that time, increased daytime temperature rises, more active creatures and plants.
calendar spring consists of 3 months.March, April, May - the spring months in the Northern Hemisphere.In the southern spring begins in September and ends in November.
At the household level, the arrival of spring is determined by the calendar.In real life, it does not obey the spring and in the southern regions occurs earlier, and in the northern delayed.
Astronomical spring
This term coined by astronomers.It comes into its own in the day when spring begins at the sun.In the Northern Hemisphere, it accounted for 20 (21) in March, on the opposite side of the Earth is a unique phenomenon observed 22 (23) of September.Ends astronomical spring to the summer solstice.
Climate
spring offensive climate of spring depends on the average daily temperature.If the average daily temperature consistently greater than 0 degrees, the spring comes, otherwise - is delayed.
In the central part of Russia spring comes the end of March.In areas with a cold climate there is no climatic summer, so spring merges with the fall.In the southern regions, on the contrary, there is no climate of winter and spring, too drained to fall.
Phenological spring
beginning of phenological spring snowmelt is the period (in the field of education thawed).Ends Spring onset of summer, which is determined by flowering wild rose.
In the vegetable world of botany determined the onset of spring at the beginning of movement of juice from the maple.
Modern holidays and spring equinox
When spring starts on Sun, coming holiday astrologers.They mark his 20th of March.Holiday informal, but it is held every year around the world by people who are not indifferent to astrology.
Vernal Equinox Day - one of the favorite holidays in Japan.Although this is not a religious holiday, it is closely connected with the traditions of the ancient religion of Japan.During this period the cherry blossoms, the Japanese visit the graves of the dead.
In ancient Persia, called Nowruz holiday.Much later, he was recognized by Islam.It is a national holiday in Iran.Nowruz celebration is common in Central Asia, the Caucasus, in northwest China, and even in the Balkans.
The Baha'i religion also has a holiday Navruz.It always starts with the sunrise of the twentieth of March.
day of the vernal equinox is revered in Islam.In Nizari is a sacred day.
In Egypt, the holiday is called Sham el-Nessim,.In ancient times, it coincided with the beginning of astronomical spring.Later celebratory date was moved to Easter Monday.In Egypt, it is a national holiday that unites the entire population.
main holiday in Christianity - Easter.It is celebrated every year at different times.However, the date of the holiday is calculated by priests from the day when spring begins at the sun.
