(ii) The figure below shows a timeline for BC and AD. For example, 2 BC stands for 2 yeaes Before Christ and AD stands for 3 years Anno Domini (which means in the year of the Lord i.e. after Christ was born).
What is the main difference between the timeline for BC and AD, and the number line?
(iii) How many years are there between 2 BC and 3 AD?
(iv) Think of another real-life example that is similar to the timeline in (ii) but different from the number line in (i).
(This is a math question please i know difference between B.C & A.D but the timeline i dont know)
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iii) A2A
The word “between” indicates not including either end. There were 3 such years: 1BC, 1AD, and 2AD. There was no 0 year. When the BC/AD system was created by Europeans, they didn't have the number 0 at their disposal. That's why, according to the calculation of Jesus' birth, Jesus turned 1 at the beginning of 2AD.
This is also why the definition of the 20th century exists. Traditionally it's 1900–1999, but with the knowledge above (about 0), a competing theory now exists that the 20th century is 1901–2000.
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