Holocene calendar

The Holocene calendar, also known as the Holocene Era or Human Era (HE), is a year numbering system that adds exactly 10,000 years to the currently dominant (AD/BC or CE/BCE) numbering scheme, placing its first year near the beginning of the Holocene geological epoch and the Neolithic Revolution, when humans shifted from a hunter-gatherer lifestyle to agriculture and fixed settlements. The current year by the Gregorian calendar, AD , is HE in the Holocene calendar. The HE scheme was first proposed by Cesare Emiliani in 1993 (11993 HE), though similar proposals to start a new calendar at the same date had been put forward decades earlier. Cesare Emiliani's proposal for a calendar reform sought to solve a number of alleged problems with the current Anno Domini era, also called the Common Era, which number the years of the commonly accepted world calendar. These issues include: The Anno Domini era is based on the erroneous or contentious estimates of the birth year of Jesus of Nazareth. The era places Jesus's birth year in AD 1, but modern scholars have determined that it is more likely that he was born in or before 4 BC. Emiliani argued that replacing the contested date with the approximate beginning of the Holocene makes more sense. The birth date of Jesus is a less universally relevant epoch event than the approximate beginning of the Holocene. The years BC/BCE are counted down when moving from past to future, making calculation of time spans difficult. The Anno Domini era has no year "zero", with 1 BC followed immediately by AD 1, complicating the calculation of timespans further. Instead, HE uses the "beginning of human era" as its epoch, arbitrarily defined as 10,000 BC and denoted year 1 HE, so that AD 1 matches 10,001 HE. This is a rough approximation of the start of the current geologic epoch, the Holocene (the name means entirely recent). The motivation for this is that human civilization (e.g. the first settlements, agriculture, etc.) is believed to have arisen within this time.