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In that location are 100 years in a century. While a century can technically describe any menstruation of 100 years, it'south typically defined as starting with a year that ends in one and catastrophe 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 calendar or New Style Calendar that nigh of the world uses today.

Decades

Each century is fabricated up of 10 decades, a series of 10 years. Like centuries, decades tin cover whatsoever period of 10 years. But when referencing the Gregorian agenda, a decade begins in a twelvemonth 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. Even so, it's more common for people to starting time and end a yr before. In this instance, the 1990s began in 1990 and ended in 1999.

Y ears

Both centuries and decades are fabricated upwardly of years. A yr is a menstruum of 12 months that begins on Jan i and ends on December 31. Each year is as well made up of about 365.25 days. However, most people consider a year to last but 365 days. And then, every four years, those 4 actress quarters come together to create a year that lasts 366 days. This is called a leap year. A twelvemonth is also the period of time that it takes for the Earth to revolve around the sun.

M onths

Each year is divided into 12 months. Some months — January, March, May, July, Baronial, October and December — are fabricated upwardly of 31 days. April, June, September and November are made up of 30 days. February is typically made upwards of 28 days, only during a leap year, it has an extra 29th day. The timing of the months was based on the moon'south orbit.

D ays and Weeks

Days are periods of roughly 24 hours that get-go 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 7 days in a calendar 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.

S easons

Another style to measure time is by counting the four seasons: bound, summer, fall and winter. Seasons change based on the style the Globe tilts on its axis equally it revolves effectually the lord's day. Each season lasts for about three months. Spring begins in March at the time of the spring equinox. Summer begins in June at the time of the summer solstice. Autumn begins in September at the time of the autumn equinox. Wintertime begins in December at the time of the winter solstice.

T he Gregorian Calendar

Most of today's measurements of time are based on the Gregorian calendar, which was made official by Pope Gregory XIII in 1582. It took the identify of the Julian calendar, which was establish to exist slightly inaccurate. Italy, Poland, Portugal and Kingdom of spain were the commencement countries to use it. Many Protestant countries hesitated to use information technology considering they felt it was a ploy by Catholics to suppress their views. In 1752, England and the colonies that went on to course the Usa adopted information technology. It remains the almost widely-used calendar.