Watches Review Center Report:Time unit conversion
= 1 minute 60 seconds
60 minutes = 1 hour
24 hours = 1 day
7 days = 1 week
365.25 days = 1 year
100 years = 1 century
1 mean solar day = 24 hours 3 minutes 56.555 seconds
1 sidereal day = 23 hours, 56 minutes 4.091 seconds
1 solar year (tropical year) = 365.2422 days
(= 365 days 5 hours 48 minutes 46 seconds)
1 sidereal year = 365.2564 days
(= 365 days 6 hours 9 minutes 9.5 seconds)
1 lunar month = 29.5306 days
1 sidereal month = 27.3712 days
1 solar year = 12 synodic days = 354.36 days
Extension of time students
Time this is a sport. If the universe static, there is no so-called time, the definition of time is defined by the stars of the operation. We do not need any "measurement criteria", they can know better now how high the day the sun or moonlight, the dough the night; However, if we are to determine the between day and night cycle at some point, the non-there are some "measure guidelines "should not.
"Measurement Guidelines" to develop, to meet a person's needs; the need arise, relatively speaking, in human history is quite recent. Is a great change in the Neolithic Age, the human into a new environment: the former nomadic tribes, clan family, and lived by hunting; was common to use a set time frame, there is a common activity, they gradually came to the gathering together, settle down, they switched to farming. Developed villages, and gradually, people will at different times, some specific trade. The continuous expansion of trade and trade activities, markets must set a fixed time and place.
Because of the emergence of this new human situation, only the definition of the time, only the division. Humans began to compile the number of time, but have become increasingly precise calculation.
In fact, the development of civilization is still elementary at this time, people just based on the position of the sun, the object's shadow, has been able to say about what time; in the next several years, this has been very adequate human. Until then, man locked himself into contention point of time every second cage, since all activities are dominated by time.
From the shadow to the quartz, I hope you time with us in this journey together on roaming.
Shadow of time
The shadow of the earth, you can display the position of the sun in the sky. Today, more than half of a region of the world's people, still be content with such an instruction "time" method.
Long ago, in the Yellow River, the Ganges and the Nile area, which is the birthplace of the great ancient civilization, mankind has committed to improving the observation of the shadow in the "time level" changes on the way, and thus the "time interval" with which "water bell" or "drip" is a tandem with development.
Someone tell their own age - he is in accordance with the "time level" basis, provided some information. Some Christians, in theory, be considered arbitrary to the year of the birth of Jesus Christ, as the "time level" the starting point; Now, this base has been generally agree with it. Therefore, we would say, Kongzi Sheng Sung Yuan in 551 BC built in the public 960 years, died in 1297.
In this "time level" to find a place for himself on the first day and then must have had a time. In China, earthquake, flood, fire or even the beginning of a dynasty and other major events, can be used as "time level" on the reference point.
The man speaks his own age, say from home to office, it takes thirty minutes - his expression was a "time interval", which can be placed in thirty minutes "time level" in any place.
Now we can use the stopwatch to measure the "time interval", simply press a button, the second hand immediately began to move.
For the measurement of time, the "time level" and "time interval" are two basic concepts, because these two concepts can calculate the time of human activities.
Days in the "time level" on the accumulation of. Measure the angle of the shadow, can be divided into a series of day the order of hours. If have the same object, whether it is simple wooden, stone tip of a tree without trial, as long as they cast shadows, and regardless of the shadow is cast on the ground is not a wall, this object is the "Day Gui" is huge "sun bell "a member of the family.
This sundial apparatus, in the development of various civilizations in the content or vary, but always there had been. Some very sophisticated, and can even display the number of seconds. However, this requires extremely deep knowledge of mathematics, the different curvature are calculated; because in different seasons, different time of sunshine, for example, the latitude of Beijing in the summer sunshine may be twice the winter, so must It is also taken into account.
Level dial with a sundial, to be north-south. Some interesting addition to dial at the sundial, there is a small gun: first in the fire safety and a magnifying glass on the door, and then anti-gun tune small, making it towards the front in the midday sun when the branch; the sun through a magnifying glass, together in one point, it will promptly at noon to a small cannon fire.
The flow of time
To express the time to water is most apt, Chinese history have so many great poets chant, to express more or less sad.
In ancient times, the water clock, or drip is used to measure a certain length of time. For example, several farmers, sharing a channel of water irrigated land, water each household would have to decide the length of fields. They will use a bottom hole of the container, a certain amount of water outflow from the hole; field poured field time for the three containers of water out of the time, to the Oda, was half the container flowing out of time.
If a designated star to be a rising, began to flow out of the container to be based on "time level", the night is divided into different time periods; sunrise before we go back to the sundial.
In Egypt, Mesopotamia and China, due to the needs of astronomy, have developed the use of drip to the peak. The initial trickle, but simply a calibrated container, and horizontal line to display the time. Fill the drip water, horizontal to rise; water leakage from the container left at the bottom of the hole, the horizon will fall.
1500 BC, the Chinese people to change this device to make it into the shape of a water leak.
The ancient Greeks also used a very sophisticated mechanism to express the horizontal movements, the time is displayed on the clock face.
As early as the 11th century, Chinese people have extended to the limits of the technology trickle down: the use of water power to start huge mechanical devices.
Heaven, Earth,
Since time immemorial, the Chinese people to regard the universe as a great organism. "Universal Ecological this universe has its part to" want to find out what the meaning or ultimate goal, is useless.
Perhaps because of this, in China, the art of attention than the subject of empirical science; until the 20th century, there had been scared empirical science flash development, conditions have changed.
Its energy to nourish God, and who this creature, with heaven and earth there is a mutual influence between the association entirely.
Before 1911, "Doing Nothing" (dry matter to bother about other things) has been cited maxim deeply into China's ancient emperors on the throne!
Implication is: when the activity is completed, self-will automatically decline. Therefore, the constant change is the law of the universe, and will always be dominated by this Law. This is the law of yin and yang - yin and yang is the symbol of life and destroy the two fundamental inseparable; things there is no absolute, just as day and night, dawn and dusk as it combines.
It has a long history behind the theory, as much like truth, is all the more China is the 10th century and 11th century was a period of breathtaking.
However, since the Stone Age, man has gradually domesticated, citing the power of some non-human (such as ox-drawn vehicles, wind sails, oars to push water), and gradually increase their domination of the environment, and that these have prompted the man to shut himself Among the cultural barriers in their own.
Solar time
Defined time, just like the other units, is a measure of the standard as the basis, like: Rice, kg and points.
Earth's rotation around the sun, its position changes, the decision of the "Day" of the length, but also the formation of a "season" and "Year." These words, still preserved the ancient to the concept of Earth as the center of the universe, the so-called geocentric; also because of this, people will still say that the sunrise and sunset, but in fact the position of the sun in the solar system is fixed.
Earth's annual orbit around the sun along the week, totaling 365 days 5 hours 48 minutes 45 seconds (the average is 365.2425) days, this so-called "tropical year." A "calendar year" there were 365 days; every four years - to be divisible by 4 days of the time - day in February will increase to make up for years by deleting each of the 5 hours 48 minutes 45 seconds.
The length of day from 8 hours to 16 hours depending on the change of seasons; an obvious change in the seasons, indicating a greater distance to the equator. Around the Earth to the sun year round, but also within in 23.9345 hours rotates around its own axis, and outlined between two poles oval shape. The distance between the Earth's axis and the minor changes in the sun, divided into different seasons.
According to ancient Chinese legend, the Han Dynasty had dreamed of his mother before the birth of the sun (yang) climbed into the belly. The sun is hot gas formed by the sphere, a symbol of fruitful and multiply, symbolizes the monarchy. However, almost one hundred billion stars of our galaxy into the body, the sun is nothing but just a little, "Antares (aka Scorpio a Star)" to five times older than she was!
Two thousand five hundred years before the Christian era, the Chinese astronomers have identified vernal equinox and the winter solstice and other solar terms, the solar terms on the calculation of the alternating seasons extremely helpful. Vernal equinox and the autumnal equinox, Earth's equatorial plane of the sun across the day; Equinox in March 21st or the 22nd, the autumnal equinox in September 22 or the 23rd. Day and night on this day is exactly the same length of time. As the summer solstice winter solstice, about June 21 and December 21, in these days, the maximum distance from the sun with the equator.
Moon Time
Why there will be the watch word twelve hour drive it? It turned out a total of twelve lunar year, the time naturally divided into twelve segments.
Between the lunar month and the month, Tai fourteen hours can be the difference, which ranges from 6 hours in 29 and 29 at 20 hours. With other contemporaries of the ancient civilization, Chinese people also believe that one month there were 29 or 30 days, so 354 days a year, instead of 365 days; therefore less every year about 10.875 days, or almost one every three years less months. So the emperor issued decree to require that every three years later set up more a month, is the tenth of March, the calendar on a remedy gaps. How to adjust, depending on the constellation the sun between the public position.
Lunar month an average of 12 hours 44 minutes 29 2.97 seconds. In order to simplify this problem, so each month there were 30 or 31, take turns alternately; alone except in February, only 28, so that the total number remained at 365 days. Also taking into account seasonal changes, the balance sheet for the August 31, instead of 30 days; this additional day, in fact, taken in February came from.
The reason why the month is divided into four weeks, because there are four phases of the moon on (the new moon, winding, full moon and last quarter); 4 x 7.25 days, there are 29 a month. Furthermore, only knew there are seven ancient planets, seven, is a sacred number, and things are perfect on the sky, dominates the sky, is the moon - the moon can be considered a symbol of harmony of biological, naturally, there are seven days a week .
Chinese Mid-Autumn Festival is to commemorate the legend of the Goddess Chang'e of the word. August 15 each year, the day of autumnal equinox, will celebrate the event, one of China's three major festivals. Only women only allowed to participate in the relevant rites, because the moon is yin.
Article Source: http://www.watchreviewcenter.com
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