You Will Never 30 Years Before Again
There are 100 years in a century. While a century tin technically describe any period of 100 years, it'southward typically defined as starting with a twelvemonth that ends in 1 and catastrophe 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 nigh of the globe uses today.
Decades
Each century is made upwards of ten decades, a series of 10 years. Like centuries, decades can comprehend whatsoever menses of 10 years. But when referencing the Gregorian calendar, a decade begins in a yr 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. All the same, it's more than mutual for people to start and cease a yr earlier. In this example, 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 January 1 and ends on December 31. Each year is also fabricated upwardly of nearly 365.25 days. However, nearly people consider a year to last only 365 days. So, every 4 years, those iv extra quarters come up together to create a year that lasts 366 days. This is called a leap yr. A year is also the period of fourth dimension that it takes for the Earth to circumduct around the sun.
Thousand onths
Each year is divided into 12 months. Some months — Jan, March, May, July, Baronial, Oct and December — are made up of 31 days. April, June, September and November are made upwards of 30 days. Feb is typically made upwardly of 28 days, merely during a spring twelvemonth, it 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 start at midnight and finish at 11:59 p.chiliad. every dark. Each day covers the time catamenia it takes for the Globe to rotate on its centrality. There are 7 days in a calendar week: Mon, Tuesday, Wednesday, Thursday, Friday, Sat and Dominicus. Saturday and Sunday are the weekend, while Monday through Friday are weekdays. At that place are 52 weeks in a yr.
South easons
Some other way to mensurate time is by counting the four seasons: spring, summer, autumn and wintertime. Seasons change based on the way the Earth tilts on its axis as information technology revolves around the dominicus. Each season lasts for about iii months. Spring begins in March at the time of the leap equinox. Summer begins in June at the fourth dimension of the summer solstice. Fall begins in September at the time of the autumn equinox. Winter begins in December at the time of the winter solstice.
T he Gregorian Agenda
Most of today'due south measurements of time are based on the Gregorian calendar, which was made official past Pope Gregory 13 in 1582. It took the place of the Julian calendar, which was plant to exist slightly inaccurate. Italian republic, Poland, Portugal and Kingdom of spain were the first countries to use it. Many Protestant countries hesitated to use it because they felt it was a ploy by Catholics to suppress their views. In 1752, England and the colonies that went on to form the Us adopted it. Information technology remains the well-nigh widely-used calendar.
Source: https://www.reference.com/science/many-years-century-4529a3117df04677?utm_content=params%3Ao%3D740005%26ad%3DdirN%26qo%3DserpIndex
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