The Solar Year

________ invented a giant gnomon with a height of 44ft.

________, the khan's brilliant Chinese chief astronomer, was given the job of creating the calendar.

When ________ conquered China in 1276, the Daming calendar was used.

In 1912, ________ adopted the Gregorian calendar.

In 100 BCE, _______ sets a Chinese calendar based on a solar year.

________ changes the Roman calendar to include a leap day every four years and a year length of 365 days and 6 hours.

________ introduces the Gregorian calendar, a revision of the antiquated Julian calendar, using the same 365.25- day year as Guo's Shoushi calendar.

He used a 164-foot gnomon to determine that the solar year is 365 days, 5 hours, 49 minutes, and 15 seconds long.

He introduces the Gregorian calendar, a revision of the antiquated Julian calendar, using the same 365.25-day year as Guo's Shoushi calendar.

Emperor Wu of the Han Dynasty sets a Chinese calendar based on a solar year.

Julius Caesar changes the Roman calendar to include a leap day every four years and a year length of 365 days and 6 hours.

the Shoushi calendar

Ulugh Beg used a 164-foot gnomon to determine that the solar year is 365 days, 5 hours, 49 minutes, and 15 seconds long.

Pope Gregory introduces the Gregorian calendar, a revision of the antiquated Julian calendar.

A 365.25-day solar year was used when it was first formalized in the first century BCE during the ______.

China’s calculations were different. They were ___ years ahead of the West’s calendar.

When _____ conquered China in 1276, the Daming calendar was used.

Year Kublai Khan conquered China

When Kublai Khan conquered China in 1276, the _____ calendar was used.

the khan's brilliant Chinese chief astronomer, was given the job of creating the Shoushi calendar.

An ______ is a tool used to simulate the positions of celestial bodies.

Guo created a _______ version of armillary sphere.

Guo's task was to establish an observatory in _____ order to measure the length of the solar year.

Guo started a series of observations to track the motion of the sun throughout the year in collaboration with mathematician _____.

In 1279, Guo and Wand declared that a month had _____ days

In 1279, Guo and Wand declared that an actual solar year has ______ days.

The ______ was widely regarded as the most accurate calendar in the world at their time and it continued to be used for 363 years.

China adopted the Gregorian calendar.

Guo invented a giant _____ with a height of 44ft. This allowed him to measure the angle of the sun with far greater accuracy.