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The two notation systems are numerically equivalent: "2025 CE" and "AD 2025" each describe the current year; "400 BCE" and "400 BC" are the same year. [ 1 ] [ 2 ] The expression can be traced back to 1615, when it first appears in a book by Johannes Kepler as the Latin : annus aerae nostrae vulgaris ( year of our common era ), [ 3 ] [ 4 ] and ...
Conversion from Gregorian calendar years to Before Present years is by starting with the 1950-01-01 epoch of the Gregorian calendar and increasing the BP year count with each year into the past from that Gregorian date. For example, 1000 BP corresponds to 950 AD, 1949 BP corresponds to 1 AD, 1950 BP corresponds to 1 BC, 2000 BP corresponds to ...
A.M. (or AM) – for the Latin Anno Mundi, meaning "in the year of the world", has its epoch in the year 3761 BC. This was first used to number the years of the modern Hebrew calendar in 1178 by Maimonides. Precursors with epochs one or two years later were used since the 3rd century, all based on the Seder Olam Rabba of the 2nd century. The ...
The date used as the end of the ancient era is arbitrary. The transition period from Classical Antiquity to the Early Middle Ages is known as Late Antiquity.Late Antiquity is a periodization used by historians to describe the transitional centuries from Classical Antiquity to the Middle Ages, in both mainland Europe and the Mediterranean world: generally from the end of the Roman Empire's ...
11th millennium BC · 11,000–10,001 BC 10th millennium BC · 10,000–9001 BC 9th millennium BC · 9000–8001 BC 8th millennium BC · 8000–7001 BC 7th millennium BC · 7000–6001 BC 6th millennium BC · 6000–5001 BC 5th millennium BC · 5000–4001 BC 4th millennium BC · 4000–3001 BC 40th century BC: 39th century BC: 38th century BC ...
For computational reasons, astronomical year numbering and the ISO 8601 standard designate years so that AD 1 = year 1, 1 BC = year 0, 2 BC = year −1, etc. [c] In common usage, ancient dates are expressed in the Julian calendar, but ISO 8601 uses the Gregorian calendar and astronomers may use a variety of time scales depending on the ...
Early Iron Age (c. 1050 BC – 776 BC) – part of the Greek Dark Ages; Classical antiquity (776 BC – 476 AD) Archaic Greece (776 BC – 480 BC) – begins with the First Olympiad, traditionally dated 776 BC; Classical Greece (480 BC – 338 BC) Macedonian era (338 BC – 323 BC) Hellenistic Greece (323 BC – 146 BC) Late Roman Republic (147 ...
The 1st century BC, also known as the last century BC and the last century BCE, started on the first day of 100 BC and ended on the last day of 1 BC. The AD/BC notation does not use a year zero; however, astronomical year numbering does use a zero, as well as a minus sign, so "2 BC" is equal to "year –1". 1st century AD (Anno Domini) follows.