What textbooks are the monks and their party in?

The monk and his party are in the junior high school history textbook.

Monk and his party are famous astronomers. He is now in the history textbook. He compiled a book "Great Yan Li", discussing how to calculate the 24 solar terms and the time when the sun shines, how to calculate the positions of the sun, the moon and the five major planets, and how to calculate the solar eclipse. It records seventy-two phases, sixty-four hexagrams, and the law of definite leap. The length of surface shadow and day and night leakage is also calculated. He also built many astronomical instruments and carried out large-scale astronomical observation activities.

The main achievements of the monk and his party:

1, manufacturing ecliptic travel instrument

The bank advocates compiling calendars on the basis of actual measurement. To this end, it is first necessary to have instruments to measure the position of celestial bodies. In the 9th year of Kaiyuan (AD 72 1), he led a government soldier, Cao Jun, to join the army in Lianglingzan, designed the patrol etiquette of the zodiac, and made it into a wooden model.

2, manufacturing water transport armillary sphere

Later, the delegation and Liang Lingzan designed and manufactured the water elephant. This water-powered elephant, with a time-telling device, can automatically tell the time, which is called "muddy sky on water" or "overlooking view of muddy sky on water in Kaiyuan".

3. Astronomical measurement

After the imperial edict was changed to calendar, a group organized and launched a large-scale astronomical geodesy. This survey completely negates the wrong theory of "the shadow of the sun is one inch, and the earth is thousands of miles away" with measured data, and provides quite accurate length of the first arc of the meridian of the earth.

4. Make a big calendar

From the 13th year of Kaiyuan (AD 725), the bank began to compile calendars. After two years, referring to the nine-year calendar, I compiled a draft and named it Dayan Calendar.