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In that location are 100 years in a century. While a century tin technically describe any period of 100 years, it's typically defined every bit starting with a year that ends in 1 and ending in a year that ends in 00 or 100. For example, the 20th century began in 1901 and concluded in 2000. The 21st century began in 2001 and will end in 2100. This measurement of time is based on the Gregorian agenda or New Style Calendar that almost of the earth uses today.

Decades

Each century is made up of 10 decades, a series of ten years. Like centuries, decades can cover whatsoever period of 10 years. Just when referencing the Gregorian calendar, a decade begins in a twelvemonth that ends with one and ends with a year that ends in 0. For case, the 1990s officially began in 1991 and ended in 2000. Nevertheless, information technology's more than common for people to first and terminate a year earlier. In this case, the 1990s began in 1990 and ended in 1999.

Y ears

Both centuries and decades are fabricated up of years. A year is a period of 12 months that begins on January one and ends on December 31. Each year is also made up of about 365.25 days. However, most people consider a yr to final only 365 days. So, every four years, those four extra quarters come together to create a twelvemonth that lasts 366 days. This is called a leap year. A year is also the flow of time that it takes for the World to revolve around the sun.

M onths

Each year is divided into 12 months. Some months — January, March, May, July, August, October and Dec — are made up of 31 days. April, June, September and November are fabricated up of xxx days. February is typically fabricated upwardly of 28 days, only during a leap year, it has an actress 29th day. The timing of the months was based on the moon's orbit.

D ays and Weeks

Days are periods of roughly 24 hours that get-go at midnight and end at 11:59 p.one thousand. every night. Each day covers the time period it takes for the World to rotate on its axis. At that place are vii days in a week: Monday, Tuesday, Wednesday, Thursday, Fri, Saturday and Sunday. Sabbatum and Sunday are the weekend, while Mon through Fri are weekdays. There are 52 weeks in a year.

S easons

Another fashion to mensurate time is by counting the four seasons: spring, summer, fall and winter. Seasons change based on the way the Earth tilts on its axis as it revolves around the sun. Each flavor lasts for about 3 months. Leap begins in March at the time of the spring equinox. Summertime begins in June at the time of the summertime solstice. Autumn begins in September at the time of the fall equinox. Winter begins in Dec at the time of the winter solstice.

T he Gregorian Calendar

Virtually of today's measurements of time are based on the Gregorian calendar, which was fabricated official by Pope Gregory XIII in 1582. It took the place of the Julian calendar, which was found to be slightly inaccurate. Italy, Poland, Portugal and Spain were the first countries to use it. Many Protestant countries hesitated to use information technology considering they felt it was a ploy past Catholics to suppress their views. In 1752, England and the colonies that went on to grade the United States adopted information technology. It remains the near widely-used calendar.