A birthday on the globe
9 December on the globe: what happened in the world on this day, and who was born
For 9 December, the English Wikipedia lists 62 events and 265 births. 27 of the events stand at their places as rays of light; 10 more are dashed circles, where the sentence links only to a country or a sea. The taller the ray, the longer ago it happened. The people born that day come further down, as blue points.
A birthday, yours or someone else’s:
Turn it into a greetingScroll: the globe turns to each place
The day you were born, on the globe.
Three things from your day
Scroll: your day first, then 9 December through the years
The Earth on 9 December
The picture on the globe was assembled by NASA from satellite photographs taken in December 2004: the snow, the ice and the green are those of the month.
On 9 December the Sun passes straight overhead at noon along the parallel of 22.8° south. In London, the day lasts about 8 hours.
Beyond 67° south the Sun no longer sets; beyond 67° north it no longer rises.
The line between day and night is tilted on the globe exactly as on this day of the year. On the dark side you can see the lights of towns.
Britain & Ireland · Palace of Westminster
1868
The first traffic lights are installed, outside the Palace of Westminster in London. Resembling railway signals, they use semaphore arms and are illuminated at night by red and green gas lamps.
On the map: Palace of Westminster.
Europe · French Academy of Sciences
1822
French physicist Augustin-Jean Fresnel, in a memoir read to the Academy of Sciences, coins the terms linear polarization, circular polarization, and elliptical polarization, and reports a direct refraction experiment verifying his theory that optical rotation is a form of birefringence.
On the map: French Academy of Sciences.
North America · Montreal
1851
The first YMCA in North America is established in Montreal.
On the map: Montreal.
Also on the day’s list of Wikipedia in Spanish and Chinese.
9 December
What the other Wikipedias remember#
For these years the English list has nothing on this day. The events below come from the same day’s lists on Wikipedia in Chinese and Spanish and were translated for this page.
From Wikipedia in Chinese · United Nations Convention on the Law of the Sea
1984
The United Nations announces that 159 countries have signed the United Nations Convention on the Law of the Sea.
On the map: United Nations Convention on the Law of the Sea.
Translated from the list on Wikipedia in Chinese.
From Wikipedia in Spanish · Kyoto
1997
In Kyoto, the Kyoto Protocol enters into force.
On the map: Kyoto.
Translated from the list on Wikipedia in Spanish.
9 December
Born on 9 December#
The English Wikipedia lists 265 births for this day. The blue points are the birthplaces of 60 of these people: those written about in the most Wikipedia editions, where Wikidata gives a place of birth.
Born on 9 December
1608
John Milton, English poet and philosopher (died 1674)
Place of birth: Cheapside.
Born on 9 December
1842
Peter Kropotkin, Russian zoologist, economist, geographer, and philosopher (died 1921)
Place of birth: Moscow.
Born on 9 December
1916
Kirk Douglas, American actor, singer, and producer (died 2020)
Place of birth: Amsterdam.
Born on 9 December
1868
Fritz Haber, Polish-German chemist and academic, Nobel Prize laureate (died 1934)
Place of birth: Wrocław.
Born in Britain and Ireland
1942
Billy Bremner, Scottish footballer and manager (died 1997)
Place of birth: Stirling.
Born in Britain and Ireland
1997
Harvey Barnes, English footballer
Place of birth: Burnley.
Born in Britain and Ireland
1813
Thomas Andrews, Irish chemist and physicist (died 1885)
Place of birth: Belfast.
9 December
Number one in the charts that week
At the cinema
An animal recorded that day
The record can be seen in GBIF, which brings together wildlife records from around the world.
All your birthdays
The weather that day
Data: Met Office Hadley Centre (HadCET); NOAA (GHCN-Daily, Mauna Loa).
Above the Earth
Sources: Jonathan McDowell, GCAT (launches); GFZ Potsdam (Kp index). Days are counted in Universal Time.
Football that day
International matches played that day:
Source: the “International football results” dataset kept by Mart Jürisoo (CC0).
Also that day
The earthquake’s page at the USGS
Source: the USGS catalogue. The day is counted in Universal Time (UTC).
In those days
Make a link for someone
Type the name, pick the day and the year of birth. The link opens straight on their day, with their name in the greeting.
The link carries the name, date and place typed here; anyone who gets it can see them.
Put another birthday beside it
Your mother’s, your child’s, a friend’s: the two days appear side by side.
Below: 9 December through the years.
The whole globe of the day
Drag the globe to turn it. Touch a ray or a point to read what happened there.
Everything Wikipedia lists for 9 December
The list is the English Wikipedia’s, in its own wording, as it stood in October 2026. 25 events have no place on the map: the sentence links to no place with coordinates, only to places too wide to mark, or to several countries.
- 536
Gothic War: The Byzantine general Belisarius enters Rome unopposed; the Gothic garrison flees the capital.
no place on the mapWikipedia: Gothic War - 730
Battle of Marj Ardabil: The Khazars annihilate an Umayyad army and kill its commander, al-Jarrah ibn Abdallah al-Hakami.
Asia · ArdabilWikipedia: Battle of Marj Ardabil - 1432
The first battle between the forces of Švitrigaila and Sigismund Kęstutaitis is fought near the town of Oszmiana (Ashmyany), launching the most active phase of the Lithuanian Civil War.
Europe · AshmyanyWikipedia: Lithuanian Civil War - 1531
The Virgin of Guadalupe first appears to Juan Diego at Tepeyac, Mexico City.
Latin America · Our Lady of GuadalupeWikipedia: Our Lady of Guadalupe - 1636
The Qing dynasty of China, led by Emperor Hong Taiji, invades Joseon.
no place on the mapWikipedia: Qing invasion of Joseon - 1688
In one of two substantial military actions in England during the Glorious Revolution, forces loyal to William of Orange were decisively victorious at the Battle of Reading.
Britain & Ireland · Battle of ReadingWikipedia: Glorious Revolution - 1775
American Revolutionary War: British troops and Loyalists, misinformed about Patriot militia strength, lose the Battle of Great Bridge, ending British rule in Virginia.
North America · Battle of Great BridgeWikipedia: Battle of Great Bridge - 1822
French physicist Augustin-Jean Fresnel, in a memoir read to the Academy of Sciences, coins the terms linear polarization, circular polarization, and elliptical polarization, and reports a direct refraction experiment verifying his theory that optical rotation is a form of birefringence.
Europe · French Academy of SciencesWikipedia: Augustin-Jean Fresnel - 1824
Patriot forces led by General Antonio José de Sucre defeat a Royalist army in the Battle of Ayacucho, putting an end to the Peruvian War of Independence.
Latin America · Battle of AyacuchoWikipedia: Battle of Ayacucho - 1835
Texas Revolution: The Texian Army captures San Antonio following the Siege of Béxar.
North America · Texas RevolutionWikipedia: Siege of Béxar - 1851
The first YMCA in North America is established in Montreal.
North America · MontrealWikipedia: YMCA - 1856
The Iranian city of Bushehr surrenders to occupying British forces.
Asia · BushehrWikipedia: Iran - 1861
American Civil War: The Joint Committee on the Conduct of the War is established by Congress.
North America · United States CongressWikipedia: American Civil War - 1868
The first traffic lights are installed, outside the Palace of Westminster in London. Resembling railway signals, they use semaphore arms and are illuminated at night by red and green gas lamps.
Britain & Ireland · Palace of WestminsterWikipedia: Traffic light - 1872
In Louisiana, P. B. S. Pinchback becomes the first African American governor of a U.S. state following the impeachment of Henry C. Warmoth.
North America · LouisianaWikipedia: Louisiana - 1888
The first edition of the Argosy magazine was published under the title The Golden Argosy.
no place on the mapWikipedia: Argosy - 1892
The English association football club Newcastle United was founded by the merger of Newcastle East End and West End.
no place on the mapWikipedia: Association football - 1893
National Assembly bombing by Auguste Vaillant during the Ère des attentats (1892–1894).
Europe · National Assembly bombingWikipedia: National Assembly bombing - 1897
French actress, journalist and leading suffragette Marguerite Durand founded the feminist newspaper La Fronde.
no place on the mapWikipedia: Marguerite Durand - 1905
In France, a law separating church and state is passed.
no place on the mapWikipedia: 1905 French law on the Separation of the Churches and the State - 1911
A mine explosion near Briceville, Tennessee, kills 84 miners despite rescue efforts led by the United States Bureau of Mines.
North America · Cross Mountain Mine disasterWikipedia: Cross Mountain Mine disaster - 1917
World War I: Field Marshal Allenby captures Jerusalem from the Ottoman Empire.
Asia · Battle of JerusalemWikipedia: World War I - 1917
World War I: The Kingdom of Romania signs the Armistice of Focșani with the Central Powers.
Europe · Kingdom of RomaniaWikipedia: Armistice of Focșani - 1922
Gabriel Narutowicz is elected the first president of Poland.
no place on the mapWikipedia: Gabriel Narutowicz - 1931
The Constituent Cortes approves a constitution which establishes the Second Spanish Republic.
Europe · Second Spanish RepublicWikipedia: Spanish Constitution of 1931 - 1935
Student protests occur in Beijing's Tiananmen Square, and are subsequently dispersed by government authorities.
Asia · BeijingWikipedia: December 9th Movement - 1935
Walter Liggett, an American newspaper editor and muckraker, is killed in a gangland murder.
no place on the mapWikipedia: Walter Liggett - 1937
Second Sino-Japanese War: Battle of Nanking: Japanese troops under the command of Lt. Gen. Yasuhiko Asaka launch an assault on the Chinese city of Nanking.
Asia · Battle of NankingWikipedia: Battle of Nanking - 1940
World War II: Operation Compass: British and Indian troops under the command of Major-General Richard O'Connor attack Italian forces near Sidi Barrani in Egypt.
Africa · Operation CompassWikipedia: World War II - 1941
World War II: China, Cuba, Guatemala, and the Philippine Commonwealth declare war on Germany and Japan.
no place on the mapWikipedia: Republic of China - 1946
The Constituent Assembly of India meets for the first time to write the Constitution of India.
no place on the mapWikipedia: Constitution of India - 1946
The subsequent Nuremberg trials begin with the Doctors' Trial, prosecuting physicians and officers alleged to be involved in Nazi human experimentation and mass murder under the guise of euthanasia.
Europe · Aktion T4Wikipedia: Subsequent Nuremberg trials - 1948
The Genocide Convention is adopted.
Europe · ParisWikipedia: Genocide Convention - 1950
Cold War: Harry Gold is sentenced to 30 years in jail for helping Klaus Fuchs pass information about the Manhattan Project to the Soviet Union. His testimony is later instrumental in the prosecution of Julius and Ethel Rosenberg.
Asia · Soviet UnionWikipedia: Cold War - 1953
Red Scare: General Electric announces that all communist employees will be discharged from the company.
no place on the mapWikipedia: McCarthyism - 1956
An Aeroflot Lisunov Li-2 crashes near Anadyr, killing all 12 people on board.
no place on the mapWikipedia: Aeroflot - 1956
Trans-Canada Air Lines Flight 810-9, a Canadair North Star, crashes near Hope, British Columbia, Canada, killing all 62 people on board.
North America · Trans-Canada Air Lines Flight 810-9Wikipedia: Trans-Canada Air Lines Flight 810-9 - 1960
The first episode of Coronation Street, the world's longest-running television soap opera, is broadcast in the United Kingdom.
no place on the mapWikipedia: Coronation Street - 1961
Tanganyika Territory gained independence from Britain before becoming part of Tanzania three years later.
no place on the mapWikipedia: Tanganyika Territory - 1961
Tanganyika becomes independent from Britain.
Africa · TanganyikaWikipedia: Tanganyika - 1965
Kecksburg UFO incident: A fireball is seen from Michigan to Pennsylvania; with witnesses reporting something crashing in the woods near Pittsburgh.
North America · Kecksburg UFO incidentWikipedia: Kecksburg UFO incident - 1968
Douglas Engelbart gave what became known as "The Mother of All Demos", publicly debuting the computer mouse, hypertext, and the bit-mapped graphical user interface using the oN-Line System (NLS).
no place on the mapWikipedia: The Mother of All Demos - 1969
U.S. Secretary of State William P. Rogers proposes his plan for a ceasefire in the War of Attrition; Egypt and Jordan accept it over the objections of the PLO, which leads to civil war in Jordan in September 1970.
no place on the mapWikipedia: War of Attrition - 1971
Indo-Pakistani War: The Indian Air Force executes an airdrop of Indian Army units, bypassing Pakistani defences.
no place on the mapWikipedia: Meghna Heli Bridge - 1973
British and Irish authorities sign the Sunningdale Agreement in an attempt to establish a power-sharing Northern Ireland Executive and a cross-border Council of Ireland.
Britain & Ireland · Sunningdale AgreementWikipedia: Sunningdale Agreement - 1979
The eradication of the smallpox virus is certified, making smallpox the first of only two diseases that have been driven to extinction (with rinderpest in 2011 being the other).
no place on the mapWikipedia: Smallpox - 1981
Mumia Abu-Jamal was arrested for the murder of Philadelphia police officer Daniel Faulkner; his subsequent conviction and death sentence generated controversy in the United States.
no place on the mapWikipedia: Mumia Abu-Jamal - 1987
Israeli–Palestinian conflict: The First Intifada begins in the Gaza Strip and West Bank.
Asia · Gaza StripWikipedia: Israeli–Palestinian conflict - 1990
In Serbia's first multi-party election, Slobodan Milošević won the presidential election and the Socialist Party of Serbia won the majority of seats in the National Assembly.
no place on the mapWikipedia: 1990 Serbian general election - 1992
American troops land in Somalia for Operation Restore Hope.
Africa · SomaliaWikipedia: Unified Task Force - 1996
Gwen Jacob is acquitted of committing an indecent act, giving women the right to be topless in Ontario, Canada.
no place on the mapWikipedia: Female toplessness in Canada - 2003
A blast in the center of Moscow kills six people and wounds several more.
Europe · 2003 Mokhovaya Street bombingWikipedia: 2003 Mokhovaya Street bombing - 2006
Space Shuttle program: Space Shuttle Discovery is launched on STS-116 carrying the P5 truss segment of the International Space Station.
no place on the mapWikipedia: Space Shuttle program - 2008
Governor of Illinois Rod Blagojevich is arrested by federal officials for crimes including attempting to sell the U.S. Senate seat being vacated by President-elect Barack Obama.
no place on the mapWikipedia: Governor of Illinois - 2012
A plane crash in Mexico kills seven people including singer Jenni Rivera.
Latin America · 2012 Nuevo León Learjet 25 crashWikipedia: 2012 Nuevo León Learjet 25 crash - 2013
At least seven are dead and 63 are injured following a train accident near Bintaro, Indonesia.
Asia · IndonesiaWikipedia: 2013 Bintaro train crash - 2016
At least 57 people are killed and a further 177 injured when two schoolgirl suicide bombers attack a market area in Madagali, Adamawa, Nigeria in the Madagali suicide bombings.
Africa · Madagali suicide bombingsWikipedia: Madagali suicide bombings - 2016
President Park Geun-hye of South Korea is impeached by the country's National Assembly in response to a major political scandal.
no place on the mapWikipedia: Park Geun-hye - 2017
The Marriage Amendment Bill receives royal assent and comes into effect, making Australia the 26th country to legalize same-sex marriage.
Oceania · AustraliaWikipedia: Marriage Amendment (Definition and Religious Freedoms) Act 2017 - 2019
A volcano on Whakaari / White Island, New Zealand, kills 22 people after it erupts.
Oceania · 2019 Whakaari / White Island eruptionWikipedia: 2019 Whakaari / White Island eruption - 2021
Fifty-five people are killed and more than 100 injured when a truck with 160 migrants from Central America overturned in Chiapas, Mexico.
Latin America · ChiapasWikipedia: Central America - 2022
Members of the European Parliament, including Vice President Eva Kaili, and their associates are arrested in connection with the Qatar corruption scandal.
no place on the mapWikipedia: Qatar corruption scandal at the European Parliament
What the other Wikipedias remember
For these years the English list has nothing on this day. The events below come from the same day’s lists on Wikipedia in Chinese and Spanish and were translated for this page.
- 1984
The United Nations announces that 159 countries have signed the United Nations Convention on the Law of the Sea.
Latin America · United Nations Convention on the Law of the SeaTranslated from the list on Wikipedia in ChineseWikipedia: 联合国海洋法公约 - 1997
In Kyoto, the Kyoto Protocol enters into force.
Who was born on 9 December
In order of how many Wikipedia editions have an article about each. The first 60 of 265 are shown.
- 1608
John Milton, English poet and philosopher (died 1674)
CheapsideWikipedia: John Milton - 1842
Peter Kropotkin, Russian zoologist, economist, geographer, and philosopher (died 1921)
- 1916
Kirk Douglas, American actor, singer, and producer (died 2020)
AmsterdamWikipedia: Kirk Douglas - 1934
Judi Dench, English actress
- 1954
Jean-Claude Juncker, Luxembourger lawyer and politician, Prime Minister of Luxembourg
Redange sur AttertWikipedia: Jean-Claude Juncker - 1868
Fritz Haber, Polish-German chemist and academic, Nobel Prize laureate (died 1934)
WrocławWikipedia: Fritz Haber - 1946
Sonia Gandhi, Italian-Indian politician
LusianaWikipedia: Sonia Gandhi - 1906
Grace Hopper, American admiral and computer scientist, designed COBOL (died 1992)
New York CityWikipedia: Grace Hopper - 1594
Gustavus Adolphus of Sweden (died 1632)
Stockholm PalaceWikipedia: Gustavus Adolphus - 1742
Carl Wilhelm Scheele, Swedish Pomeranian and German pharmaceutical chemist (died 1786)
StralsundWikipedia: Carl Wilhelm Scheele - 1920
Carlo Azeglio Ciampi, Italian economist and politician, 10th President of Italy (died 2016)
- 1953
John Malkovich, American actor and producer
ChristopherWikipedia: John Malkovich - 1895
Dolores Ibárruri, Spanish activist, journalist and politician (died 1989)
GallartaWikipedia: Dolores Ibárruri - 1917
James Rainwater, American physicist and academic, Nobel Prize laureate (died 1986)
CouncilWikipedia: James Rainwater - 1926
Henry Way Kendall, American physicist, photographer, and mountaineer, Nobel Prize laureate (died 1999)
- 1717
Johann Joachim Winckelmann, German archaeologist and historian (died 1768)
- 1962
Felicity Huffman, American actress and producer
BedfordWikipedia: Felicity Huffman - 1987
Hikaru Nakamura, Japanese-American chess player
HirakataWikipedia: Hikaru Nakamura - 1919
William Lipscomb, American chemist and academic, Nobel Prize laureate (died 2011)
ClevelandWikipedia: William Lipscomb - 1969
Bixente Lizarazu, French footballer
Saint-Jean-de-LuzWikipedia: Bixente Lizarazu - 1929
Bob Hawke, Australian union leader and politician, 23rd Prime Minister of Australia (died 2019)
BordertownWikipedia: Bob Hawke - 1911
Broderick Crawford, American actor (died 1986)
PhiladelphiaWikipedia: Broderick Crawford - 1929
John Cassavetes, American actor, director, and screenwriter (died 1989)
New York CityWikipedia: John Cassavetes - 1980
Simon Helberg, American actor, comedian, and musician
Los AngelesWikipedia: Simon Helberg - 1748
Claude Louis Berthollet, French chemist and academic (died 1822)
TalloiresWikipedia: Claude Louis Berthollet - 1963
Empress Masako, Japanese consort of Emperor Naruhito
Toranomon HospitalWikipedia: Empress Masako - 1905
Dalton Trumbo, American author, screenwriter, and blacklistee (died 1976)
MontroseWikipedia: Dalton Trumbo - 1966
Kirsten Gillibrand, American lawyer and politician
- 1901
Ödön von Horváth, Hungarian-German author and playwright (died 1938)
- 1972
Tré Cool, German-American drummer and songwriter
FrankfurtWikipedia: Tré Cool - 1988
Kwadwo Asamoah, Ghanaian footballer
- 1968
Kurt Angle, American freestyle and professional wrestler
Mt. LebanonWikipedia: Kurt Angle - 1941
Beau Bridges, American actor, director, and producer
HollywoodWikipedia: Beau Bridges - 1915
Elisabeth Schwarzkopf, German-Austrian soprano and actress (died 2006)
- 1973
Stacey Abrams, American politician and activist
MadisonWikipedia: Stacey Abrams - 1981
Mardy Fish, American tennis player
- 1579
Martin de Porres, Peruvian saint (died 1639)
- 1952
Michael Dorn, American actor and voice artist
LulingWikipedia: Michael Dorn - 1978
Gastón Gaudio, Argentinian tennis player
AdroguéWikipedia: Gastón Gaudio - 1889
Hannes Kolehmainen, Finnish-American runner (died 1966)
- 1909
Douglas Fairbanks Jr., American captain, actor, and producer (died 2000)
New York CityWikipedia: Douglas Fairbanks Jr. - 1964
Paul Landers, German guitarist
Treptow-KöpenickWikipedia: Paul Landers - 1978
Jesse Metcalfe, American actor and musician
Carmel Valley VillageWikipedia: Jesse Metcalfe - 1891
Maksim Bahdanovič, Belarusian poet and critic (died 1917)
- 1942
Billy Bremner, Scottish footballer and manager (died 1997)
StirlingWikipedia: Billy Bremner - 1991
Choi Min-ho, South Korean singer and actor
IncheonWikipedia: Choi Min-ho - 1995
McKayla Maroney, American gymnast
Long BeachWikipedia: McKayla Maroney - 1902
Margaret Hamilton, American schoolteacher, actress and voice artist (died 1985)
ClevelandWikipedia: Margaret Hamilton - 1508
Gemma Frisius, Dutch mathematician and cartographer (died 1555)
DokkumWikipedia: Gemma Frisius - 1983
Dariusz Dudka, Polish footballer
Kostrzyn nad OdrąWikipedia: Dariusz Dudka - 1447
Chenghua Emperor of China (died 1487)
BeijingWikipedia: Chenghua Emperor - 1883
Alexander Papagos, Greek general and politician, 152nd Prime Minister of Greece (died 1955)
- 1956
Jean-Pierre Thiollet, French journalist and author
PoitiersWikipedia: Jean-Pierre Thiollet - 1997
Harvey Barnes, English footballer
BurnleyWikipedia: Harvey Barnes - 1932
Donald Byrd, American trumpet player and academic (died 2013)
DetroitWikipedia: Donald Byrd - 1957
Donny Osmond, American singer-songwriter, dancer, and actor
- 1813
Thomas Andrews, Irish chemist and physicist (died 1885)
BelfastWikipedia: Thomas Andrews - 1960
Caroline Lucas, English activist and politician
MalvernWikipedia: Caroline Lucas - 1967
Joshua Bell, American violinist and conductor
BloomingtonWikipedia: Joshua Bell - 1977
Imogen Heap, English singer-songwriter and keyboard player
Harold WoodWikipedia: Imogen Heap
What is celebrated on 9 December
- Anna's Day, marks the day to start the preparation process of the lutefisk to be consumed on Christmas Eve, as well as a Swedish name day, celebrating all people named Anna. (Sweden and Finland)
- Armed Forces Day (Peru)
- Christian feast day: Feast of the Conception of the Most Holy Theotokos by St. Anne (Eastern Orthodox Church)
- Christian feast day: Hannah (biblical figure) (Eastern Orthodox Church)
- Christian feast day: Juan Diego
- Christian feast day: Leocadia
- Christian feast day: Nectarius of Auvergne
- Christian feast day: Peter Fourier
- Christian feast day: December 9 (Eastern Orthodox liturgics)
- Fatherland's Heroes Day (Russia)
- Independence Day, celebrates the independence of Tanganyika from Britain in 1961. (Tanzania)
- International Anti-Corruption Day (United Nations)
- National Heroes Day, formerly V.C. Bird Day. (Antigua and Barbuda)
- Navy Day (Sri Lanka)
A greeting link for someone
Type a name and, if you like, the year of birth. The link opens with a greeting, and beside each event it says how old the person turned that day, or how many years before their birth it happened.
The name and the year go only into the link you send.
All 366 days
How the globe is made
Where the events come from
Each edition of this page uses the day’s list from Wikipedia in its own language: Romanian, English, Spanish, Chinese. The lists are written by volunteers and differ from one edition to the next; the text of each event is Wikipedia’s, with a link to the article. A row that appears twice in a list is shown once. The lists have not been checked event by event: they are Wikipedia’s, mistakes included.
For events before 1582, and for countries that moved to the Gregorian calendar later (Britain in 1752, Russia in 1918), the same day may be counted Old Style in one list and New Style in another.
The chapter “What the other Wikipedias remember” adds up to five events a day from the lists of the other three editions, only for years in which the English list has nothing on that day. They were translated for this page, passed the same filters as the tour, and are not counted among the events of the English list.
How an event gets onto the map
The place comes from Wikidata. If the sentence links to the article about the event itself (a battle, an opening, an earthquake), dated to the same year, the ray stands on its coordinates or on those of its location. Otherwise it stands on the first place the sentence links to: a town, a building, a mountain, an island. This second step can be wrong: sometimes the sentence only mentions the place. That is why the page says, under each event, which place the ray stands on.
When the sentence links to a single state or province, or to a single sea, lake or desert larger than 5,000 km², the globe shows a dashed circle, not a ray. The circle has the area Wikidata gives, with its radius kept between 1.2° and 16°, or a radius of 4.5° when Wikidata gives no area; it says only that the sentence links to that place. Organisations, ships, spacecraft, museum objects, rivers, mountain ranges, languages and continents are never used as places. When a sentence names several states and no exact place, the event stays in the list only.
What the height means
The height of a ray shows how many years have passed, on a logarithmic scale: 10 years, 100 years and 1,000 years are equal steps apart; anything older than about 2,600 years has the tallest ray. The colour runs from pale yellow for recent years to violet for antiquity.
Where the tour stops
In each region the tour stops at up to three events (five in Britain and Ireland), chosen mainly by three things: whether Wikipedia’s editors put the event in the “On this day” box of their main page (the English, Spanish and Chinese editions), how many Wikipedia editions have an article about it, and how many of the four lists include it. Events whose sentence or article is about a war, an attack, a crime or a disaster are left out of the tour; they stay in the whole list, in Wikipedia’s wording. The filter is a list of words and a list of Wikidata types, so it can miss some.
The tour of births names the people with articles in the most editions and leaves aside those whom the list or Wikidata describes as rulers, politicians, commanders, leaders of movements or criminals; they stay in the list.
The Earth and the Sun
The daytime images are NASA’s Blue Marble Next Generation mosaics, one for each month of 2004; the night side is Black Marble 2016. The tilt of the line between day and night is computed for the day; the hour is chosen so that the place being read is in daylight. The latitude where the Sun stands overhead is the average of the four years of the leap cycle; in a given year it can differ by up to 0.4°.
The day you were born
The number ones come from the weekly lists on Wikipedia: Billboard for the United States (from 1940; the Hot 100 from August 1958), the UK Singles Chart (from November 1952), Los 40 Principales for Spain (from July 1966) and, for Romania, the Romanian Top 100 and Airplay 100 (2001–2021, with missing weeks). The page shows the chart of the week in which the day of birth falls, with its date; Billboard and the UK chart are dated at the end of their week. For Romania before 2001 and for China these sources have no weekly chart.
The films are those that reached cinemas in the United States up to ten days before or three days after that day (some of them in a few cinemas at first), from the English Wikipedia’s yearly lists (from 1968), in order of how many editions have an article about them. The events “in those days” are the ones on the neighbouring days’ lists that carry the year of birth, passed through the same filter as the tour.
The day of birth, year included
The Moon, the star sign and the constellation are worked out by the page itself, for noon Universal Time on the day. The lit part of the Moon is rounded and can differ by a few per cent from that at the hour of birth. The sign follows the usual zodiac of twelve equal parts starting at the March equinox; the constellation is the one the Sun actually stood in front of, by the borders set by the International Astronomical Union, and within a day of a border the page does not name it. When the Sun changes sign while it is that day anywhere on Earth, the page gives the moment of crossing, rounded to ten minutes and accurate to within about a quarter of an hour, and the clock time in a few cities, with the time zone and summer time of that year.
The year in the Chinese calendar is the one your device’s own calendar gives for the date, checked against the Hong Kong Observatory’s tables. “All your birthdays” uses the same sources as the rest of the chapter for the same day in every year since the birth: the temperature, well-known launches that took place on that very day, matches of the teams the edition follows, snow deeper than 10 cm and strong geomagnetic storms. The three things at the top and the four on the picture are chosen in a fixed order (the song, the animal, a full Moon, a well-known launch before an ordinary earthquake); on the picture you can change them.
When the link carries a year of birth, the page adds a few things about that exact day. The weather is the Met Office’s Central England temperature record and the readings from New York’s Central Park; the “usual high” is the average of the daily highs of 1961–1990 for that date, with two days either side. The carbon dioxide figure is the monthly mean at the Mauna Loa observatory, where measurements begin in March 1958.
The earthquake is the one with the largest magnitude in the USGS catalogue for that day, counted in Universal Time. Before the 1960s the catalogue has gaps even above magnitude 5.5, so in the older years many days have no earthquake. The page gives only the magnitude and the place: the country the epicentre falls in or, when the epicentre is at sea within 300 km of a coast, the nearest country; farther out, only the ocean.
The launches are those that reached orbit or left for the Moon and the planets, from Jonathan McDowell’s GCAT catalogue. If nothing left that day, the page shows the nearest launch within three days before or after, and says how many days away it was. The geomagnetic storm appears only when the Kp index reached at least 5 in one of the day’s eight three-hour intervals.
The animal comes from GBIF: an observation made by a person (the animal seen or heard, or its tracks), dated to that exact day, with coordinates and a CC0 or CC BY licence. Only a few hundred well-known species are searched (mammals, birds, turtles, butterflies); of those noted that day, mammals and species with articles in many Wikipedia editions come first; birds noted almost every day, and species used recently, wait their turn. Observations dated 1 January are left out, because records without a day are often filed there. An observation shows that the animal was recorded there, not how many animals there were.
The matches are those between national teams. Only matches of England, Scotland, Wales, Northern Ireland, the Republic of Ireland, the United States, Canada and Australia are shown, along with those at the big final tournaments. The picture to send is drawn in the page from the day’s globe and the facts above, and stays on your device until you send it.
Sources
- Events, births and holidays: the day’s page on Wikipedia, text under CC BY-SA 4.0.
- Coordinates, places of birth and the number of editions: Wikidata (CC0).
- The Earth by day: NASA Blue Marble Next Generation. The Earth by night: NASA Black Marble 2016.
- Borders and regions: Natural Earth.
- World population and births per year: UN World Population Prospects 2024.
- Charts and films: Wikipedia’s lists for Billboard, the UK Singles Chart, Los 40 Principales, Romanian Top 100, Airplay 100 and American films by year (CC BY-SA 4.0).
- Weather: Met Office Hadley Centre, HadCET (Open Government Licence) and NOAA GHCN-Daily, New York Central Park. Carbon dioxide: NOAA Global Monitoring Laboratory, Mauna Loa.
- Earthquakes: the USGS catalogue. Launches: Jonathan McDowell, GCAT (CC BY). Kp index: GFZ Potsdam (CC BY 4.0). Matches: International football results, Mart Jürisoo (CC0).
- Animal observations: GBIF, with a link to each record; species names come from Wikidata.