Answer
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Step 1:I'll solve this historical/calendar problem step by step:
Step 2:: Understanding Century Definitions
The definition of a century is based on how we count years. A century technically begins with the year ending in "01" and concludes with the year ending in "00".
Step 3:: Explaining the Numbering System
- The 1st century spans from year 1 to year 100 - The 2nd century spans from year 101 to year 200 - Similarly, the 20th century spans from year 1901 to year 2000
Step 4:: Clarifying the Mathematical Logic
This occurs because there was no year "0" in the Gregorian calendar system. The calendar jumped directly from 1 BC to 1 AD, creating an offset in century calculations.
Step 5:: Practical Example
- 19th century: 1801 - 1900 - 20th century: 1901 - 2000 - 21st century: 2001 - 2100
Final Answer
The 20th century starts in 1901 because centuries are counted from years ending in "01" to years ending in "00", with no year zero in the calendar system.
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