October 18

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October 18 is the 291st day of the year(292nd in leap years) in the Gregorian calendar. 74 days remain until the end of the year.

A leap year is a calendar year containing one additional day added to keep the calendar year synchronized with the astronomical or seasonal year. Because seasons and astronomical events do not repeat in a whole number of days, calendars that have the same number of days in each year drift over time with respect to the event that the year is supposed to track. By inserting an additional day or month into the year, the drift can be corrected. A year that is not a leap year is called a common year.

The Gregorian calendar is the calendar used in most of the world. It is named after Pope Gregory XIII, who introduced it in October 1582. The calendar spaces leap years to make the average year 365.2425 days long, approximating the 365.2422-day tropical year that is determined by the Earth's revolution around the Sun. The rule for leap years is:

Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. For example, the years 1700, 1800, and 1900 are not leap years, but the year 2000 is.

Contents

Events

320 Year

Year 320 (CCCXX) was a leap year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantinus and Constantinus. The denomination 320 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Pappus of Alexandria Greek mathematician of Antiquity

Pappus of Alexandria was one of the last great Greek mathematicians of Antiquity, known for his Synagoge (Συναγωγή) or Collection, and for Pappus's hexagon theorem in projective geometry. Nothing is known of his life, other than, that he had a son named Hermodorus, and was a teacher in Alexandria.

614 Year

Year 614 (DCXIV) was a common year starting on Tuesday of the Julian calendar. The denomination 614 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Births

1127 Year

Year 1127 (MCXXVII) was a common year starting on Saturday of the Julian calendar.

Emperor Go-Shirakawa Emperor of Japan

Emperor Go-Shirakawa was the 77th emperor of Japan, according to the traditional order of succession. His reign spanned the years from 1155 through 1158, while he remained effectively in power for almost 37 years.

Year 1130 (MCXXX) was a common year starting on Wednesday of the Julian calendar.

Deaths

AD 31 (XXXI) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Tiberius and Sejanus. The denomination AD 31 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Sejanus Ancient Roman general

Lucius Aelius Sejanus - alternatively spelled Seianus -, commonly known as Sejanus, was an ambitious soldier, friend and confidant of the Roman Emperor Tiberius. An equestrian by birth, Sejanus rose to power as prefect of the Roman imperial bodyguard, known as the Praetorian Guard, of which he was commander from AD 14 until his death in AD 31.

325 Year

Year 325 (CCCXXV) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Proculus and Paulinus. The denomination 325 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Holidays and observances

Alaska Day is a legal holiday in the U.S. state of Alaska, observed on October 18. It is the anniversary of the formal transfer of the Territory of Alaska from Russia to the United States, which occurred on Friday, October 18, 1867.

United States Federal republic in North America

The United States of America (USA), commonly known as the United States or America, is a country comprising 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is slightly smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U.S. is the third most populous country. The capital is Washington, D.C., and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico. The State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean. The U.S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The extremely diverse geography, climate, and wildlife of the United States make it one of the world's 17 megadiverse countries.

Asclepiades of Antioch was Patriarch of Antioch and martyr. He succeeded Serapion as Patriarch of Antioch in 211. He was given the title of martyr, due to the trials he endured during Roman persecution.

Others

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