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· 02 Dec 2021

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What Year It Is?

The year may also refer to any long period or cycle, such as the Great Year. Astronomical year numbering , denoted by the Greek prefix "A" (for Anno) and Latin prefix "Anno", is a system of numbering years within the Gregorian calendar that adds a consecutive integer in order to indicate the number of years after the start of this Julian Period in 1 AD.

A year can be measured by the events that occur in it, such as the birth and death of notable people, changes of government or significant economic developments . These are only some examples; there are many other events that can mark a year, such as natural disasters, economic crises , wars and changes in social trends . In English, the phrase "year of X" is used for anniversaries and for thematic years. The expression has been dated back to about 1600.

The word "annus" is Latin for "year". The related Middle English term was yere ("year") which derived from Old English āġer ("year"). Its spelling was altered by association with Latin annus. The first five times that Christopher Columbus came to what is now known as his New World was during his initial voyage in 1492 when he was trying to find.

A calendar year is an approximation of the number of days of the Earth's orbital period, as counted in a given calendar. The Gregorian calendar, or modern calendar, presents its calendar year to be either 365 or 366 days, which is slightly longer than the average length of a tropical year(365.2days) and shorter than the average length of a sidereal year (365. days).

The Gregorian calendar was introduced in 1582 as a refinement to the Julian calendar which had been in use since 45 B.C. by Julius Caesar . The Julian calendar was introduced by Julius Caesar in 46 B.C and was used for over 1000 years, until it needed to be refined by adding a leap day every 4 years without exception (the normal rule is that years divisible by 4 are not leap years). This addition corrected for the slowly accumulating error with respect to the vernal equinox: since the Julian year was slightly too long, the date of the equinox slipped away from where it should have been at the rate of about one day per century.

Eventually caused seasonal drift equinoxes to fall 10 days behind where they "should" occur; it also affected calculations of the date of Easter , which are tied to The Julian year is a near-infinite period of time with exactly 86400 seconds per day, and it is used as the basis for various Julian units such as the Julian day, Julian century and Julian millennium.

The Julian day is used in astronomy to specify when an event occurred; for example, the Solar eclipse of March 3, 2016 occurred at UT 01h 40m 40.16s on that date. The instant of midnight UTC on January 1, 2000 was Julian Date  a time of exactly 6:28:15 UTC that day.

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