Английская Википедия:Common year starting on Thursday

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Шаблон:Pp Шаблон:Short description A common year starting on Thursday is any non-leap year (i.e. a year with 365 days) that begins on Thursday, 1 January, and ends on Thursday, 31 December. Its dominical letter hence is D. The most recent year of such kind was 2015 and the next one will be 2026 in the Gregorian calendar or, likewise, 2021 and 2027 in the obsolete Julian calendar, see below for more.

This is the only common year with three occurrences of Friday the 13th: those three in this common year occur in February, March, and November. Leap years starting on Sunday share this characteristic, for the months January, April and July. From February until March in this type of year is also the shortest period (one month) that runs between two instances of Friday the 13th.

Applicable years

Gregorian Calendar

In the (currently used) Gregorian calendar, alongside Tuesday, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-four common years per cycle or exactly 11% start on a Thursday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400.

Gregorian common years starting on Thursday

Decade	1st		2nd	3rd	4th		5th	6th		7th		8th	9th		10th
16th century	prior to first adoption (proleptic)													1587	1598
17th century	1609		1615	1626	1637		1643	1654		1665		1671	1682		1693	1699
18th century	1705		1711	1722	1733	1739	1750	—		1761	1767	1778	1789		1795
19th century	1801	1807	1818	1829	1835		1846	1857		1863		1874	1885		1891
20th century	1903		1914	1925	1931		1942	1953	1959	—		1970	1981	1987	1998
21st century	2009		2015	2026	2037		2043	2054		2065		2071	2082		2093	2099
22nd century	2105		2111	2122	2133	2139	2150	—		2161	2167	2178	2189		2195
23rd century	2201	2207	2218	2229	2235		2246	2257		2263		2274	2285		2291
24th century	2303		2314	2325	2331		2342	2353	2359	—		2370	2381	2387	2398
25th century	2409		2415	2426	2437		2443	2454		2465		2471	2482		2493	2499

400-year cycle

0–99	9	15	26	37	43	54	65	71	82	93	99
100–199	105	111	122	133	139	150	161	167	178	189	195
200–299	201	207	218	229	235	246	257	263	274	285	291
300–399	303	314	325	331	342	353	359	370	381	387	398

Julian Calendar

In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a 28-year cycle (1461 weeks). A leap year has two adjoining dominical letters (one for January and February and the other for March to December, as 29 February has no letter). This sequence occurs exactly once within a cycle, and every common letter thrice.

As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula ((year + 8) mod 28) + 1). Years 3, 14 and 20 of the cycle are common years beginning on Thursday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Thursday.

Julian common years starting on Thursday

Decade	1st		2nd		3rd		4th		5th		6th		7th		8th		9th		10th
15th century	1405		1411		1422		1433	1439		1450		—		1461	1467		1478		1489	1495
16th century	1506		1517		1523		1534		1545		1551		1562		1573	1579		1590		—
17th century	1601	1607		1618		1629		1635	1646		1657		1683		1674		1685		1691
18th century	1702		1713	1719		1730		—		1741	1747	1758		1769		1775		1786		1797
19th century	1803		1814		1825		1831		1842		1853	1859	1870		—		1881	1887	1898
20th century	1909		1915		1926		1937		1943		1954		1965		1971		1982		1993	1999
21st century	2010		—		2021	2027	2038		2049		2055		2066		2077		2083		2094

Holidays

International

• • Valentine's Day falls on a Saturday
  • World Day for Grandparents and the Elderly falls on July 26
  • Halloween falls on a Saturday
  • Christmas Day falls on a Friday

Roman Catholic Solemnities

• • Epiphany falls on a Tuesday
  • Candlemas falls on a Monday
  • Saint Joseph's Day falls on a Thursday
  • The Annunciation of Jesus falls on a Wednesday
  • The Nativity of John the Baptist falls on a Wednesday
  • The Solemnity of Saints Peter and Paul falls on a Monday
  • The Transfiguration of Jesus falls on a Thursday
  • The Assumption of Mary falls on a Saturday
  • The Exaltation of the Holy Cross falls on a Monday
  • All Saints' Day falls on a Sunday
  • All Souls' Day falls on a Monday
  • The Feast of Christ the King falls on November 22 (or on its earliest possible date of October 25 in versions of the calendar between 1925 and 1962)
  • The First Sunday of Advent falls on November 29
  • The Immaculate Conception falls on a Tuesday
  • Gaudete Sunday falls on December 13
  • Rorate Sunday falls on December 20

Australia and New Zealand

• • Australia Day falls on a Monday
  • Waitangi Day falls on a Friday
  • Daylight saving ends on April 5
  • ANZAC Day falls on a Saturday
  • Mother's Day falls on May 10
  • Father's Day falls on September 6
  • Daylight saving begins on September 27 in New Zealand and October 4 in Australia

British Isles

• • Saint David's Day falls on a Sunday
  • Mother's Day falls on its earliest possible date of March 1, or on March 8, March 15, March 22 or March 29
  • Saint Patrick's Day falls on a Tuesday
  • Daylight saving begins on March 29
  • Saint George's Day falls on a Thursday
  • Father's Day falls on its latest possible date, June 21
  • Orangeman's Day falls on a Sunday
  • Daylight saving ends on its earliest possible date, October 25
  • Guy Fawkes Night falls on a Thursday
  • Saint Andrew's Day falls on a Monday

Canada

• • Daylight saving begins on its earliest possible date, March 8
  • Mother's Day falls on May 10
  • Victoria Day falls on its earliest possible date, May 18
  • Father's Day falls on its latest possible date, June 21
  • Canada Day falls on a Wednesday
  • Labour Day falls on its latest possible date, September 7 – this is the only common year when Victoria Day and Labour Day are sixteen weeks apart (they are fifteen weeks apart in all other common years)
  • Thanksgiving Day falls on October 12
  • Daylight saving ends on its earliest possible date, November 1

United States

• • Martin Luther King Jr. Day falls on January 19
  • President's Day falls on February 16
  • Daylight saving begins on its earliest possible date, March 8
  • Mother's Day falls on May 10
  • Memorial Day falls on its earliest possible date, May 25
  • Juneteenth falls on a Friday
  • Father's Day falls on its latest possible date, June 21
  • Independence Day falls on a Saturday
  • Labor Day falls on its latest possible date, September 7 – this is the only common year when Memorial Day and Labor Day are fifteen weeks apart (they are fourteen weeks apart in all other common years)
  • Grandparents' Day falls on its latest possible date, September 13
  • Columbus Day falls on October 12
  • Daylight saving ends on its earliest possible date, November 1
  • Thanksgiving Day falls on November 26