Anno Domini is a medieval Latin meaning "the year of the Lord", which Christians use to commemorate the year of Jesus' birth (XXXX year after the Lord).

Gregorian calendar era or AD is the most widely used standard in the international community. It originated in Europe and other western countries with Christian beliefs. It started with the birth of Jesus and was called the Christian calendar.

Some modern scholars and scientists are based on the principles of secularization and religious neutrality, but in order to avoid secular and non-religious academic content fields involving Christianity? In order to try to change and erase originality and its historical significance.

use

AD is the title of chronology, which is a chronology system. The chronology takes the birth of Jesus as the first year of AD, and before the first year of AD it is called BC. The so-called year 2020 is the year from the first year of AD.

It should be noted that although 0 is a natural number, it did not exist in 0 BC or 0 AD. The year after BC 1 year is AD 1 year, which is the first year of AD.

Although the chronology of BC is reversed, the figures in the back are smaller than those in the front. For example, in 202 BC, it was established in the Western Han Dynasty, which was later than 22 1 BC, and was established in the Qin Dynasty. However, the specific month of each year is still being counted, with 1 in front and 12 behind, and the date is the same, with the first day in front and the first day behind.

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history

Calendar years originated from the influence of Christianity. In 525 AD, Christian theologian Dionysus Ihiggs suggested that the year of Jesus' birth should be the first year of the era, instead of the "Diocletian calendar" adopted by the Vatican at that time (the Roman emperor Diocletian, who is famous for persecuting Christians, ascended the throne in 284 AD, commonly known as the "era of martyrs").

Iggers also calculated that Jesus was born in 754 years after the founding of ancient Rome, but later historians found that his calculation might be wrong. Jesus was not born in 1 year; It is generally believed that Jesus was born from about 7 BC to about 4 BC (Herod the Great died in 4 BC).

References:

Baidu encyclopedia-a.d.