paragraph_text: To unambiguously specify the date, dual dating or Old Style (O.S.) and New Style (N.S.) are sometimes used with dates. Dual dating uses two consecutive years because of differences in the starting date of the year, or includes both the Julian and Gregorian dates. Old Style and New Style (N.S.) indicate either whether the start of the Julian year has been adjusted to start on 1 January (N.S.) even though documents written at the time use a different start of year (O.S.), or whether a date conforms to the Julian calendar (O.S.) rather than the Gregorian (N.S.).

paragraph_text: The Feast of the Most Holy Name of the Blessed Virgin Mary is an optional memorial celebrated in the liturgical calendar of the Catholic Church on 12 September. It has been a universal Roman Rite feast since 1684, when Pope Innocent XI included it in the General Roman Calendar to commemorate the victory at the Battle of Vienna in 1683. It was removed from the Church calendar in the liturgical reform following Vatican II but restored by Pope Saint John Paul II in 2002, along with the Feast of the Holy Name of Jesus.

paragraph_text: Zeller's congruence is an algorithm devised by Christian Zeller to calculate the day of the week for any Julian or Gregorian calendar date. It can be considered to be based on the conversion between Julian day and the calendar date.

paragraph_text: The Battle of Lutter (Lutter am Barenberge) took place during the Thirty Years' War, on 27 August 1626 (17 August 1626 in the old Julian calendar), between the forces of the Lower Saxon Circle, combining mostly Protestant states, and led by its Circle Colonel Christian IV of Denmark, and the forces of the Catholic League. Lutter am Barenberge lies to the south of the modern town of Salzgitter, then within the Imperial Circle of Lower Saxony, and now in northwest Germany.

paragraph_text: The Battle of Cabrita Point, sometimes referred to as the Battle of Marbella, was a naval battle that took place while a combined Spanish-French force besieged Gibraltar on 10 March 1705 (21 March 1705 in the New Calendar) during the War of Spanish Succession.

paragraph_text: The Battle of Philippi was the final battle in the Wars of the Second Triumvirate between the forces of Mark Antony and Octavian (of the Second Triumvirate) and the leaders of Julius Caesar's assassination, Marcus Junius Brutus and Gaius Cassius Longinus in 42 BC, at Philippi in Macedonia. The Second Triumvirate declared this civil war ostensibly to avenge Julius Caesar's assassination in 44 BC, but the underlying cause was a long - brewing conflict between the so - called Optimates and the so - called Populares.

paragraph_text: The Julian calendar, proposed by Julius Caesar in 708 AUC (46 BC/BCE), was a reform of the Roman calendar. It took effect on 1 January 709 AUC (45 BC/BCE), by edict. It was the predominant calendar in the Roman world, most of Europe, and in European settlements in the Americas and elsewhere, until it was gradually replaced by the Gregorian calendar, promulgated in 1582 by Pope Gregory XIII.

paragraph_text: Three Faces East is a 1926 silent film directed by Rupert Julian and starring Jetta Goudal and Clive Brook. It is based on a popular Broadway play about spies during World War I. It was refilmed in sound in 1930. The story's action takes place in France and Britain.

paragraph_text: Although the month and date of Jesus' birth are unknown, by the early - to - mid fourth century the Western Christian Church had placed Christmas on December 25, a date that was later adopted in the East. Today, most Christians celebrate on December 25 in the Gregorian calendar, which has been adopted almost universally in the civil calendars used in countries throughout the world. However, some Eastern Christian Churches celebrate Christmas on December 25 of the older Julian calendar, which currently corresponds to January 7 in the Gregorian calendar, the day after the Western Christian Church celebrates the Epiphany. This is not a disagreement over the date of Christmas as such, but rather a preference of which calendar should be used to determine the day that is December 25. Moreover, for Christians, the belief that God came into the world in the form of man to atone for the sins of humanity, rather than the exact birth date, is considered to be the primary purpose in celebrating Christmas.

paragraph_text: The Gregorian calendar is a solar calendar. A regular Gregorian year consists of 365 days, but as in the Julian calendar, in a leap year, a leap day is added to February. In the Julian calendar a leap year occurs every 4 years, but the Gregorian calendar omits 3 leap days every 400 years. In the Julian calendar, this leap day was inserted by doubling 24 February, and the Gregorian reform did not change the date of the leap day. In the modern period, it has become customary to number the days from the beginning of the month, and February 29th is often considered as the leap day. Some churches, notably the Roman Catholic Church, delay February festivals after the 23rd by one day in leap years.

paragraph_text: The Battle of the Argeș was a battle of the Romanian Campaign of World War I. Taking place on 1 December 1916, the battle was fought along the line of the Argeș River in Romania between Austro-German forces of the Central Powers and Romanian forces.

paragraph_text: The Battle of Wittstock took place during the Thirty Years' War (1618-1648). It was fought on 24 September (Julian calendar) or 4 October (Gregorian calendar) 1636. A Swedish-allied army commanded jointly by Johan Banér and Alexander Leslie, later 1st Earl of Leven decisively defeated a combined Imperial-Saxon army, led by Count Melchior von Hatzfeld and the Saxon Elector John George I.

paragraph_text: The Gregorian calendar was introduced as a refinement of the Julian calendar in 1582, and is today in worldwide use as the de facto calendar for secular purposes.

paragraph_text: Stefan Štiljanović (; fl. 1498 – 1543) was the last prominent Serbian nobleman of the period of Ottoman subjugation of Serbia, and according to folklore, he was the last Despot of Serbia. He ruled a large territory under the Hungarian crown, due to his famed operations against the Ottoman Empire in the frontiers. Štiljanović is venerated as a Saint in the Serbian Orthodox Church on the 4 October (Julian Calendar) or 17 October (Gregorian Calendar) which comes to the same thing.

paragraph_text: The Gregorian calendar was a reform of the Julian calendar instituted in 1582 by Pope Gregory XIII, after whom the calendar was named, by papal bull Inter gravissimas dated 24 February 1582. The motivation for the adjustment was to bring the date for the celebration of Easter to the time of year in which it was celebrated when it was introduced by the early Church. Although a recommendation of the First Council of Nicaea in 325 specified that all Christians should celebrate Easter on the same day, it took almost five centuries before virtually all Christians achieved that objective by adopting the rules of the Church of Alexandria (see Easter for the issues which arose).

paragraph_text: A Julian year should not be confused with the Julian day (also Julian day number or JDN), which is also used in astronomy.  Despite the similarity of names, there is little connection between the two. It is a way of expressing a date as the integer number of days that have elapsed since a reference date or initial epoch. The Julian day uniquely specifies a date without reference to its day, month, or year in any particular calendar. A specific time within a day is specified via a decimal fraction.

paragraph_text: The Battle of Lemo was fought during the Finnish War between Sweden and Russia on 19–20 June 1808 (Julian calendar 7–8 June).

paragraph_text: The Gregorian reform contained two parts: a reform of the Julian calendar as used prior to Pope Gregory XIII's time and a reform of the lunar cycle used by the Church, with the Julian calendar, to calculate the date of Easter. The reform was a modification of a proposal made by Aloysius Lilius. His proposal included reducing the number of leap years in four centuries from 100 to 97, by making 3 out of 4 centurial years common instead of leap years. Lilius also produced an original and practical scheme for adjusting the epacts of the moon when calculating the annual date of Easter, solving a long-standing obstacle to calendar reform.

paragraph_text: The naval Battle of the Gabbard, also known as the Battle of Gabbard Bank, the Battle of the North Foreland or the second Battle of Nieuwpoort took place on 2–3 June 1653 (12–13 June 1653 Gregorian calendar). during the First Anglo-Dutch War near the Gabbard shoal off the coast of Suffolk, England between fleets of the Commonwealth of England and the United Provinces.

paragraph_text: In conjunction with the system of months there is a system of weeks. A physical or electronic calendar provides conversion from a given date to the weekday, and shows multiple dates for a given weekday and month. Calculating the day of the week is not very simple, because of the irregularities in the Gregorian system. When the Gregorian calendar was adopted by each country, the weekly cycle continued uninterrupted. For example, in the case of the few countries that adopted the reformed calendar on the date proposed by Gregory XIII for the calendar's adoption, Friday, 15 October 1582, the preceding date was Thursday, 4 October 1582 (Julian calendar).

Question: The forces of Mark Antony and Octavian fought the killers of the man behind the Julian calendar where?
Answer: Philippi in Macedonia