Anno Domini (ADor A.D.) and Before Christ (BC or B.C.) are designations used to label or number years used with the Julian and Gregorian calendars. The termAnno Domini is Medieval Latin
AD is not used in the Jewish calendar. It is only used on the Gregorian (Christian) Calendar.
It is the year the Gregorian Calendar was introduced.
In the Gregorian calendar it is 50 AD or 50 BC
It's 138 AD (as 2012 AD ⇒ 5114 Kali Yuga)
the Gregorian calendar
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The Gregorian calendar.
The calendar is intended to mark the number of years since the death of King Herod the Great. The Roman abbot Dionysus Exiguus devised the new Christian calendar in 533. He knew that it was impossible to say when Jesus was born, but he knew, or thought he knew, when Herod died. So, he chose to begin his Christian calendar on the year of Herod's death, and he based this on the reign of the Roman emperor Augustus. Unaware that Augustus only adopted that name four years after his reign began, going by his birth name of Octavius until then, Exiguus commenced his calendar just 4 years too late.
No, "Gregorian calendar" is not capitalized unless it is at the beginning of a sentence.
My calendar is a Gregorian calendar
Gregorian Calendar also part of it is AD Anno Domini which is Medieval Latin In English it means "In the Year of (the/Our) Lord"
The Gregorian Calendar is solar and the Hebrew Calendar is lunisolar.