An impression has sometimes arisen that ephemeris time was in use from 1900: this probably arose because ET, though proposed and adopted in the period 1948 – 1952, was defined in detail using formulae that made retrospective use of the epoch date of 1900 January 0 and of Newcomb's Tables of the Sun.

In the introduction to Newcomb's Tables of the Sun ( 1895 ) the basis of the tables ( p. 9 ) includes a formula for the Sun's mean longitude, at a time indicated by interval T ( in Julian centuries of 36525 mean solar days ) reckoned from Greenwich Mean Noon on 0 January 1900:

: the fraction 1 / 31 556 925. 9747 of the tropical year for 1900 January 0 at 12 hours ephemeris time.

He was appointed in July 1900, returning to Australia shortly before the inauguration of the Commonwealth of Australia on 1 January 1901.

* Tosca, libretto by Luigi Illica and Giuseppe Giacosa ( premiered at the Teatro Costanzi, 14 January 1900 )

Mathers overrode their decision and quickly initiated him at the Ahathoor temple in Paris on January 16, 1900.

However, this story is now considered baseless: although no birth certificate has ever been found, his birth notice did appear in a New York newspaper in early January 1900, which supports the December 1899 date, as do other sources, such as the 1900 census.

His contributions included the adoption of an Open Door Policy in China ( announced on January 2, 1900 ) which may have been a contributing factor in the Boxer Rebellion, and the preparations for the Panama Canal.

In Germany the unity of procedure and substance in the actio definitely has been brought to an end at the codification of the Bürgerliches Gesetzbuch ( BGB ) which came into force on January 1, 1900.

In 1900, Tax Freedom Day arrived January 22, for an effective average total tax rate of 5. 9 percent of the nation's income.

DeltaT was measured at + 65. 7768 seconds ( TT ahead of UT1 ) at 0h UTC on 1 January 2009 ; and by retrospective calculation, deltaT was close to zero around the year 1900.

* January 29 – Tomislav II of Croatia, ( Aimone 4th Duke of Aosta ), king ( b. 1900 )

The decade from January 1, 1900 to December 31, 1909 is sometimes referred to as the 1900s, " the nineteen hundreds ", although this term can equally be used for the years 1900 – 1999.

* January 26 – Stan Nichols, English cricketer ( b. 1900 )

* January 25 – Colleen Moore, American actress ( b. 1900 )

* January 14 – Guillermo de Torre, Spanish Dadaist author ( b. 1900 )

* January 15 – Yves Tanguy, French painter ( b. 1900 )

It premiered at the Teatro Costanzi in Rome on 14 January 1900.

Appleton was born in Los Angeles, California on January 4, 1939 to Jewish parents: Helen Jacobs Appleton ( born Philadelphia, 1908 ) and Charles Leonard Appleton ( born Haim Eppel Boim in Kishenov, Moldavia, 1900 ).

For example, for an epoch date of midnight UTC on January 1, 1900, and a time unit of a second, the time of the midnight between January 1 and 2, 1900 is represented by the number 86400, the number of seconds in one day.

Alfred Russel Wallace, OM, FRS ( 8 January 1823 – 7 November 1913 ) was a British naturalist, explorer, geographer, anthropologist and biologist.

Although the proposal seemed to have been approved, the plans of the British were thwarted by the uprising of Dost Muhammad's son Muhammad Akbar Khan, who defeated and annihilated the British-Indian garrison at Gandamak on its retreat from Kabul in January 1842.

Anne Brontë (; 17 January 1820 – 28 May 1849 ) was a British novelist and poet, the youngest member of the Brontë literary family.

Alexis Korner ( 19 April 1928 — 1 January 1984 ) was a blues musician and radio broadcaster, who has sometimes been referred to as " a Founding Father of British Blues ".

Following the publication of the Declaration the British had dispatched Commander David George Hogarth to see Hussein in January 1918 bearing the message that the " political and economic freedom " of the Palestinian population was not in question.

In January 1920, the British government started advertising in British cities for men willing to " face a rough and dangerous task ", helping to boost the ranks of the RIC in policing an increasingly anti-British Ireland.

In January 1921, the British Labour Commission produced a report on the situation in Ireland which was highly critical of the government's security policy.

Bloody Sunday ()— sometimes called the Bogside Massacre — was an incident on 30 January 1972 in the Bogside area of Derry, Northern Ireland, in which 26 unarmed civil-rights protesters and bystanders were shot by soldiers of the British Army.

On January 24, 1776, Henry Knox arrived with artillery captured from Fort Ticonderoga, which enabled Washington to drive the British army out of Boston.

Clement Richard Attlee, 1st Earl Attlee, KG, OM, CH, PC, FRS ( 3 January 1883 – 8 October 1967 ) was a British Labour politician who served as the Prime Minister of the United Kingdom from 1945 to 1951, and as the Leader of the Labour Party from 1935 to 1955.

Of these, sixteen were held in London, reflecting then-prevailing views of the Commonwealth as the continuation of the Empire and the centralisation of power in the British Commonwealth Office ( the one meeting outside London, in Lagos, was an extraordinary meeting held in January 1966 to coordinate policies towards Rhodesia ).

After his return from exile in India and Sikkim during January 1913, he assumed control of foreign relations and dealt directly with the Maharaja and the British Political officer in Sikkim and the king of Nepal rather than letting the Kashag or parliament do it.

Desmond John Morris FZS, born 24 January 1928 in Purton, north Wiltshire, is a British zoologist and ethologist.

As with the rest of the British Isles and South West England, the area experiences a maritime climate with warm summers and mild winters-this is particularly pronounced due to its position near the coast-extremes range from a record low of just in January 1987 up to a record high of during June 1976.

Titled Dr. Syn, Alias the Scarecrow, the British theatrical version was released on a double bill with The Sword in the Stone, and ran during the 1963 Christmas season ( advertised in the January 1964 issue of Photoplay ).

Donald Malcolm Campbell, CBE ( 23 March 1921 – 4 January 1967 ) was a British speed record breaker who broke eight world speed records in the 1950s and 1960s.

The Conscription Crisis of 1918 further intensified public support for Sinn Féin before the general elections to the British Parliament on 14 December 1918, which resulted in a landslide victory for Sinn Féin, whose MPs gathered in Dublin on 21 January 1919 to form Dáil Éireann and adopt the Declaration of Independence.

Eric Cheney ( 5 January 1924 – 30 December 2001 ) was an independent British motorcycle designer and constructor.

Meanwhile, the British presence in the west continued, until interrupted by Spain during the Falkland Crisis from 10 July 1770 to 22 January 1771.

On 1 January 1983 the Falkland Islanders gained British citizenship under the British Nationality ( Falkland Islands ) Act 1983, and on 3 October 1985 the Constitution of the Falkland Islands was established.

Washington followed up his victory at Trenton with another over British regulars at Princeton in early January.

On 1 January 1988, British Telecom ( BT ) and the Government of Gibraltar formed a joint venture company called Gibraltar Telecommunications International Ltd ( known by its commercial brand Gibtel ) to operate Gibraltar's international telecommunications services.

George Hamilton-Gordon, 4th Earl of Aberdeen ( 28 January 1784 – 14 December 1860 ), styled Lord Haddo from 1791 to 1801, was a British politician and landowner, successively a Tory, Conservative and Peelite, who served as Prime Minister of the United Kingdom from 1852 until 1855.