September 11

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September 11 is the 254th day of the year(255th in leap years) in the Gregorian calendar. 111 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

Between the years AD 1900 and 2099, September 11 of the Gregorian calendar is the leap day of the Coptic and Ethiopian calendars. These leap days occur in the years immediately before leap years in the Julian and Gregorian calendars. In all common years of the Coptic and Ethiopian calendars, September 11 is New Year's Day.

<i>Anno Domini</i> Western calendar era

The terms anno Domini (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars. The term anno Domini is Medieval Latin and means "in the year of the Lord", but is often presented using "our Lord" instead of "the Lord", taken from the full original phrase "anno Domini nostri Jesu Christi", which translates to "in the year of our Lord Jesus Christ".

Coptic calendar Egyptian liturgical calendar

The Coptic calendar, also called the Alexandrian calendar, is a liturgical calendar used by the Coptic Orthodox Church and also used by the farming populace in Egypt. This calendar is based on the ancient Egyptian calendar. To avoid the calendar creep of the latter, a reform of the ancient Egyptian calendar was introduced at the time of Ptolemy III which consisted of the intercalation of a sixth epagomenal day every fourth year. However, this reform was opposed by the Egyptian priests, and the reform was not adopted until 25 BC, when the Roman Emperor Augustus imposed the Decree upon Egypt as its official calendar. To distinguish it from the Ancient Egyptian calendar, which remained in use by some astronomers until medieval times, this reformed calendar is known as the Coptic calendar. Its years and months coincide with those of the Ethiopian calendar but have different numbers and names.

The Ethiopian calendar or Eritrean calendar is the principal calendar used in Ethiopia and also serves as the liturgical year for Christians in Eritrea and Ethiopia belonging to the Eritrean Orthodox Tewahedo Church, Ethiopian Orthodox Tewahedo Church, Eastern Catholic Churches, the Coptic Orthodox Church of Alexandria, and Ethiopian-Eritrean Evangelicalism. It is a solar calendar which in turn derives from the Egyptian calendar, but like the Julian calendar, it adds a leap day every four years without exception, and begins the year on August 29 or August 30 in the Julian calendar. A gap of 7–8 years between the Ethiopian and Gregorian calendars results from an alternative calculation in determining the date of the Annunciation.

Since 2001, the date has been widely known for the terrorist attacks that occurred on and were named after it.

September 11 attacks Attacks against the United States on September 11, 2001

The September 11 attacks were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda against the United States on the morning of Tuesday, September 11, 2001. The attacks killed 2,996 people, injured over 6,000 others, and caused at least $10 billion in infrastructure and property damage. Additional people died of 9/11-related cancer and respiratory diseases in the months and years following the attacks.

Events

AD 9 (IX) was a common year starting on Tuesday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Sabinus and Camerinus. The denomination "AD 9" for this year has been used since the late medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Battle of the Teutoburg Forest Comprehensive defeat of forces of Roman Empire in 9 CE

The Battle of the Teutoburg Forest, described as the Varian Disaster by Roman historians, took place in the Teutoburg Forest in 9 CE, when an alliance of Germanic tribes ambushed and decisively destroyed three Roman legions and their auxiliaries, led by Publius Quinctilius Varus. The alliance was led by Arminius, a Germanic officer of Varus's auxilia. Arminius had acquired Roman citizenship and had received a Roman military education, which enabled him to deceive the Roman commander methodically and anticipate the Roman army's tactical responses.

Roman Empire Period of Imperial Rome following the Roman Republic (27 BC–476 AD)

The Roman Empire was the post-Republican period of ancient Rome, consisting of large territorial holdings around the Mediterranean sea in Europe, North Africa and West Asia ruled by emperors. From the accession of Caesar Augustus to the military anarchy of the third century, it was a principate with Italy as metropole of the provinces and its city of Rome as sole capital. The Roman Empire was then ruled by multiple emperors and divided in a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople. Rome remained the nominal capital of both parts until 476 AD, when it sent the imperial insignia to Constantinople following the capture of Ravenna by the barbarians of Odoacer and the subsequent deposition of Romulus Augustus. The fall of the Western Roman Empire to Germanic kings, along with the hellenization of the Eastern Roman Empire into the Byzantine Empire, is conventionally used to mark the end of Ancient Rome and the beginning of the Middle Ages.

Births

600 (DC) was a leap year starting on Friday of the Julian calendar. The denomination 600 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.

Year 1182 (MCLXXXII) was a common year starting on Friday of the Julian calendar.

Minamoto no Yoriie 2nd shogun of Kamakura shogunate

Minamoto no Yoriie was the second shōgun (1202–1203) of Japan's Kamakura shogunate, and the first son of first shōgun Yoritomo. His buddhist name was Hokke-in-dono Kingo Da'i Zengo (法華院殿金吾大禅閤).

Deaths

883 Year

Year 883 (DCCCLXXXIII) was a common year starting on Tuesday of the Julian calendar.

Kesta Styppiotes or Stypeiotes was briefly the Domestic of the Schools of the Byzantine Empire in ca. 883.

1063 Year

Year 1063 (MLXIII) was a common year starting on Wednesday of the Julian calendar.

Holidays and observances

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References

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  2. Toksvig, Sandi (11 September 2011). "Sandi Toksvig on September 11". The Daily Telegraph. Retrieved 17 October 2018.
  3. Siggurdsson (12 September 2012). "Battle of the Teutoburg Forest: Germans Massacre Three Roman Legions". The American´s Legion BurnPit. Retrieved 17 October 2018.
  4. Ranter, Harro. "ASN Aircraft accident Sud Aviation SE-210 Caravelle VI-N YU-AHD Titograd". aviation-safety.net. Retrieved 2019-07-25.
  5. Ranter, Harro. "ASN Aircraft accident Embraer EMB-120RT Brasilia N33701 Eagle Lake, TX". aviation-safety.net. Retrieved 2019-06-30.
  6. "Companies House".
  7. "Mary Jane Reoch Inducted in 1994 for Modern Road & Track Competitor (1945-1975)". U.S. Bicycling Hall of Fame. Retrieved 16 September 2018.