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FutureStarrHow many years in a century
There are 100 years in a century. While a century can technically describe any period of 100 years, it’s typically defined as starting with a year that ends in one and ending in a year that ends in 00 or 100. For example, the 20th century began in 1901 and ended in 2000. The 21st century began in 2001 and will end in 2100. This measurement of time is based on the Gregorian calendar or New Style Calendar that most of the world uses today.
Each century is made up of 10 decades, a series of 10 years. Like centuries, decades can cover any period of 10 years. But when referencing the Gregorian calendar, a decade begins in a year that ends with one and ends with a year that ends in 0. For example, the 1990s officially began in 1991 and ended in 2000. However, it’s more common for people to start and end a year earlier. In this case, the 1990s began in 1990 and ended in 1999.Days are periods of roughly 24 hours that start at midnight and end at 11:59 p.m. every night. Each day covers the time period it takes for the Earth to rotate on its axis.
There are seven days in a week: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. Saturday and Sunday are the weekend, while Monday through Friday are weekdays. There are 52 weeks in a year.millennium, a period of 1,000 years. The Gregorian calendar, put forth in 1582 and subsequently adopted by most countries, did not include a year 0 in the transition from bc (years before Christ) to ad (those since his birth). Thus, the 1st millennium is defined as spanning years 1–1000 and the 2nd the years 1001–2000. Although numerous popular celebrations marked the start of the year 2000, the 21st century and 3rd millennium ad began on January 1, 2001. (Source: www.britannica.com)