• Sunday August 7,2022

Gregorian calendar

We explain what the Gregorian calendar is and the origin of its name. In addition, how it was composed and a bit of its history.

The Gregorian calendar name comes from Pope Gregory XIII.
  1. What is the Gregorian calendar?

It is known as the Gregorian calendar of the original calendar of Europe, of current acceptance throughout the world since it replaced the Julian calendar in the year of 1582. Its name comes from Pope Gregory XIII (1505- 1585), who was his most important promoter, especially through the papal bull Inter gravissimas (1582).

This calendar was adopted by Spain, Italy and Portugal in that same year, but found resistance in the Anglo-Saxon world, especially in Great Britain and its colonies, until 1752. It is currently the world calendar, and was the product of studies sent to the Holy See by academics of the University of Salamanca, as a way of carrying out the agreements of the Council of Trent (1545-1563) to improve and complete the existing Julian calendar from the year 46 BC

There was already a lag in calendar matters since the Council of Nicea (325), due to an inaccurate calculation of the days of the year, which produced a variation n 10 days a year. To solve it, a Commission of the Calendar was appointed headed by the astronomers Crist bal Clavio and Luis Lilio, the first a Jesuit mathematician and the second one of the Main authors of the Gregorian calendar.

The new calendar solved the problems of temporal accuracy by proposing that the year be 365 days (actually 365, 2425 days), and instead of having every four years one year Leap, that is, 366 days, as proposed by the Julian calendar, leap years will be available when their last two figures are divisible by 4 or 400, except for the multiples of 100.

This, mathematically, implies an advance of minute every 3300 years, which in human life time does not seem to mean much, but in the long run it also causes problems since the speed of rotation Earth tends to slow down over time, due to the force of lunar attraction. This has been determined from sustained measurement thanks to atomic clocks, but it is not too problematic in practical terms.

Instead, the month-to-month discrepancy of the number of business days (working), between 24 and 27 depending on the number of weeks of each month (depending on whether you have 30 or 31 days, or 28 or 29 for February). This implies that, in the long term, our calendar will require, very in the future, new adjustments to recover its accuracy.

It can serve you: Julian Calendar.


Interesting Articles

Law of the Offer

Law of the Offer

We explain what the offer law is and what the supply curve is for. In addition, the law of demand and what factors determine it. The law of supply justifies the quantity of a product in the market. What is the law of supply? It is known as the law of the offer, an economic and commercial principle that justifies the quantity available in the market of a particular product (that is, its offer), based on its requirement

Spermatogenesis

Spermatogenesis

We explain what spermatogenesis is and the phases in which this process is divided. In addition, what is azoospermia and oogenesis? Spermatogenesis takes place in the male sex glands. What is spermatogenesis? It is called a spermatogenesis , or spermatocytogenesis , the process of generation or production of sperm , which takes place inside the male sex glands (test Circles), specifically in the seminiferous tubes, coiled ducts of about 30 to 60 cm

Olympic Games

Olympic Games

We explain to you what the olympic games are and what is their origin and history. In addition, we list all the Olympic disciplines. The Olympics date back to Greek antiquity (around the 8th century BC). What are the Olympic Games? The Olympic Games (Olympic Games) (or also the Olympic Games ) are the largest international sporting event in the world , in which athletes representing virtually all of the competitors compete

Xenophobia

Xenophobia

We explain what xenophobia is, what are its causes and examples. In addition, its relationship with racism and discrimination. The origin of the xenophobia could be assumed at the beginning of human civilization. What is xenophobia? It is called `` xenophobia '' to fear, contempt or hatred of people who come from a nation or a culture different from their own , that is, foreigners, including their cultural manifestations, their language or anything that can Associate with the foreign

Mortality

Mortality

We explain what mortality is, what is the mortality rate and what is birth. In addition, infant morbidity and mortality. It is known that human mortality is higher in men than in women. What is mortality? Human beings are mortal, that is, we are going to die, and therefore we have a particular relationship with mortality

Refr.

Refr.

We explain to you what a saying is and some short sayings spread in the Spanish language. In addition, some popular sayings. Some sayings offer a solution to deal with dilemmas or complicated moments. What is a refrain? A saying is a saying or phrase that expresses a teaching or moral , often formulated with a rhyme or some other literary figure