Why does BC start at 4000 year?
Its because this is based on the modern Gregorian calendar which comes from the Julian calendar (Roman) and is based on time being measured as A.D. or B.C. Anno Domini or Before Christ. So BC works backwards from “before” when Christ was born. A.D. is “after” the birth of Christ. It goes back 4000 years because that is how far back it goes to the time of Adam and Eve and creation. In the Hebrew calendar they just measure time from the beginning so they are presently on the year 5770 I believe. There is a difference in the calculations because after the flood the Earth has been taking roughly 365 days to orbit the sun. Pre-flood the Earth took 360 days, that was a year. In the Hebrew Calendar they measure the year as being 360 days, and 30 days exactly for each month. The extra days I believe get added to a leap month every so many years whereas we just have 364 or 365 days for the year, months with different number of days and leap years every four years with an extra day added to Febr
Our current calendar uses the birth, life, and death of (or what is thought to be the birth, life and death) of Jesus. Today, we are counting time forward, after the Jesus. BC stands for Before Christ, and AD stands for ‘Year of our Lord’ in Latin. This calendar was created after Jesus, so from his birth forward is ad, counting forward. From his death backwards, counting down to the event, goes backwards. So like, imagine the countdown to a race. Before the race is… 3.. 2.. 1.. Go! After the start of the race, the clock moves forward measuring how long it takes the participants. BC is like the count down, Jesus is like the Go!