2007 To 2021 How Many Years
There are 100 years in a century. While a century can technically describe any menses of 100 years, it's typically defined as starting with a year that ends in i and catastrophe in a twelvemonth 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 cease in 2100. This measurement of time is based on the Gregorian agenda or New Way Calendar that most of the globe uses today.
Decades
Each century is fabricated up of 10 decades, a series of 10 years. Like centuries, decades can cover any period of 10 years. Merely when referencing the Gregorian calendar, a decade begins in a year that ends with one and ends with a yr that ends in 0. For example, the 1990s officially began in 1991 and ended in 2000. However, it's more common for people to kickoff and finish a yr earlier. In this case, the 1990s began in 1990 and ended in 1999.
Y ears
Both centuries and decades are made upward of years. A year is a period of 12 months that begins on Jan 1 and ends on Dec 31. Each year is as well made up of about 365.25 days. Yet, most people consider a year to last only 365 days. So, every four years, those four extra quarters come together to create a year that lasts 366 days. This is called a spring year. A twelvemonth is also the period of time that it takes for the Earth to circumduct around the sun.
G onths
Each twelvemonth is divided into 12 months. Some months — January, March, May, July, Baronial, October and December — are fabricated up of 31 days. April, June, September and November are made up of 30 days. February is typically made upward of 28 days, but during a leap year, information technology has an extra 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 outset at midnight and end at eleven:59 p.chiliad. every night. Each day covers the time menstruum it takes for the World to rotate on its axis. There are seven days in a calendar week: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. Sat and Sun are the weekend, while Monday through Friday are weekdays. There are 52 weeks in a year.
S easons
Some other way to measure time is past counting the iv seasons: jump, summer, autumn and wintertime. Seasons modify based on the way the World tilts on its centrality as it revolves around the sun. Each season lasts for about three months. Spring begins in March at the fourth dimension of the leap equinox. Summer begins in June at the time of the summer solstice. Autumn begins in September at the time of the autumn equinox. Winter 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 fabricated official past Pope Gregory Thirteen in 1582. It took the place of the Julian agenda, which was found to be slightly inaccurate. Italy, Poland, Portugal and Spain were the first countries to use information technology. Many Protestant countries hesitated to use it because they felt information technology was a ploy past Catholics to suppress their views. In 1752, England and the colonies that went on to form the U.s.a. adopted it. It remains the most widely-used agenda.
Source: https://www.reference.com/science-technology/many-years-century-4529a3117df04677?utm_content=params%3Ao%3D740005%26ad%3DdirN%26qo%3DserpIndex&ueid=100cf005-164e-4d98-b476-1512be0d2f8b
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