Who wrote the most accurate calendar in ancient China and what was its name? Who wrote the new classic of Ganshi?

Classification: Education/Science >> Science and Technology

Problem description:

Don't say everything, just say one, I have to hand in my homework tomorrow! Please help me.

Analysis:

Time Calendar of Guo Shoujing in Yuan Dynasty

Timing Calendar is the best calendar in ancient China and the longest running calendar. For more than 360 years, from the promulgation of the Yuan Dynasty, through the whole Ming Dynasty to the early Qing Dynasty, the calendars used were actually time calendars, but the names were changed.

The reason why the perpetual calendar has been used for so long has a lot to do with its very high calculation accuracy. First of all, it adopted the most accurate astronomical data in the world at that time. For example, its tropical year is 365.2425 days, which is the same as the current Gregorian calendar. Secondly, it absorbs the viewpoint that the length of the tropical year in the calendar first decreases gradually, and stipulates that the length of the tropical year in a hundred years decreases by 0.000 1 day. Although this value is a bit large, it is still more accurate than that in the celestial calendar.

In addition, the compilation of almanac cancels the integration of the previous year and the method of expressing astronomical data with complex fractions, which not only greatly simplifies the calculation amount, but also ensures the calculation accuracy. There are also great innovations in the calculation method of "chronograph calendar", such as creating cubic interpolation method to correct the uneven movement of the sun and the moon; A mathematical method similar to spherics's is established to convert the longitude of the yellow meridian, the longitude of the equator and the apparent declination of the sun.

Shi Gan Xing Jing is the earliest astronomical work in the world. On the basis of long-term observation of astronomical phenomena, during the Warring States Period, the Chu people Gande (now Hubei) and Ren Wei Shen Shi (now Kaifeng, Henan) each wrote an astronomical work. Later generations called these two works A Passage to Shi Gan. The book records the names of 800 stars, among which the position of l2l star has been determined, which is the earliest star list in the world. The book also records the operation of the five planets, namely, wood, Mars, Saturn, gold and water, and finds their unforgettable laws. According to legend, Stone God wrote eight volumes of astronomy, and he measured 138 stars with 800 stars.

China people have been paying attention to astronomical phenomena for a long time. The records of meteor shower and solar eclipse in ancient books are the earliest records in the history of astronomy in the world. During the Spring and Autumn Period and the Warring States Period, astronomy made quite high achievements. Astronomers in Lu observed 37 eclipses, 33 of which were proved to be reliable. Halley's comet, which is now known all over the world, was recorded in the history book Lu Chunqiu as early as 6 13 BC, which is the earliest record of Halley's comet in the world.

Astronomical monographs also appeared in this period, such as Tian Wenxing Zhan, written by Gander of Qi, and Astronomy, written by Shi Shen of Wei, which were later combined into one book, called Shi Ganxing Jing, which is the earliest existing astronomical works in the world. The book records the movements of the five planets, water, wood, gold, fire and earth, and their unforgettable laws. The book also recorded the names of 800 stars, and now the position of 12 1 has been determined. Gander also discovered Jupiter's moon with the naked eye, more than 2,000 years before Italian astronomer Galileo discovered the star with an astronomical telescope in 1609. Stone gods found that the solar eclipse was a phenomenon in which celestial bodies blocked each other, which was also valuable at that time. To commemorate the stone god, there is a crater on the moon named after him.