In the long course of time, the two main calendar systems we use, the solar calendar and the lunar calendar, each have their own unique rules and speeds. However, the question of "is the solar calendar fast or slow" cannot be answered simply as an absolute "fast" or "slow", as each of them follows different laws of celestial motion.
The Gregorian calendar, also known as the Gregorian calendar, is based on the time it takes for the Earth to revolve around the Sun, with an average annual length of 3652425 days, in order to make up for the slight gap with the return year, the Gregorian calendar adopts the rule of one leap in four years, no leap in a hundred years, and another leap in four hundred years, so as to ensure the consistency of the solar calendar year with the change of seasons. From this point of view, the rhythm of the solar calendar is stable and scientifically accurate, and we cannot say that it is "fast" or "slow".
The lunar calendar, on the other hand, is mainly set according to the cycle of the moon revolving around the earth, with an average of about 29 in a month (synodic month).53,059 days, about 12 synodic months in a year, totaling about 35437 days. The length of the lunar year is shorter than that of the solar calendar, so if the solar calendar is used as a frame of reference, the lunar calendar seems to be "faster". However, in the Chinese lunar system, the gap between the lunar year and the solar year is adjusted by setting leap months to keep them roughly synchronized, so it cannot simply be said that the lunar calendar is "faster" than the solar calendar.
In general, the speed of the solar and lunar calendars is not directly comparable, and they correspond to the different cycles of the Earth's movement relative to the Sun and Moon, respectively. We use the solar calendar in our daily lives more because it is more in line with the changing seasons on the earth, while the lunar calendar plays an important role in traditional festivals, farming activities, etc. The two complement each other and together construct a framework for human cognition of the passage of time.
Therefore, the solar calendar is not "fast" in the absolute sense, and the lunar calendar is not absolutely "slow", they are just timekeeping methods for different astronomical phenomena, serving different areas of human life, and jointly depicting the flow of time under the movement of the stars in the universe.