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October 8, 1909

1909 Kupa Valley earthquake

Mohorovičić did not announce a boundary inside the Earth on the day the ground shook. He posted 430 questionnaires and published a year later.

Thirty kilometres south of Zagreb

On 8 October 1909 a damaging earthquake struck the Kupa Valley in the Pokupsko region, roughly 30 kilometres south of Zagreb. It was felt over a radius greater than 200 kilometres.

Two people were killed and many were injured. A mason died under a collapsing church roof at Lasinja and a roofer fell from a bell tower at Šišinac; the only damage photograph centennial investigators found shows the collapsed front wall of a church in Sisak.

Mechanical seismographs in Zagreb and across Europe recorded the earthquake's P- and S-wave arrivals, creating the observational record Andrija Mohorovičić went on to analyse.

430 questionnaires and 41 stations

Mohorovičić, director of the Zagreb Meteorological Observatory, immediately circulated macroseismic questionnaires, joined a government investigation and visited the epicentral area on 12–13 October.

He gathered 430 questionnaires and arrival-time data from 41 seismic stations, of which he used 36. Zagreb's improved Wiechert seismograph had been installed only about a year before.

His analysis distinguished direct crustal phases from waves refracted through a faster layer below, identifying the extra P- and S-wave phases across a distance range of roughly 300 to 720 kilometres.

Published in 1910, not announced on the day

The listing collapses the earthquake and the discovery into one moment. The earthquake supplied the data; the analysis was published in 1910, and it drew on records from other earthquakes and many European stations rather than a single Zagreb seismogram.

What he demonstrated was a seismic-velocity discontinuity, not a sharp density transition. P- and S-wave speeds depend on elastic moduli as well as density, so no simple proportionality to density applies.

His figure of about 54 kilometres was a model estimate for that regional dataset; modern measurements show Moho depth varying substantially by tectonic setting.

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What the sources leave uncertain

The date is secure, but numerical parameters are retrospective. A modern study gives Ms 5.78 ± 0.14 and depth 14 ± 7 kilometres, while older catalogues commonly list magnitude 6.0.
The modern epicentre has sizeable uncertainty because many 1909 observatory clocks were poorly controlled; the relocation is 45.57 ± 0.06°N, 16.01 ± 0.08°E.
Published clock times conflict: the modern reanalysis gives 08:59:11.95 for the origin, while some older English accounts say 09:59 Greenwich time. The fact sheet therefore does not attach an exact time.
The approximately 54-kilometre discontinuity depth was Mohorovičić’s model estimate for this regional dataset, not a universal Moho depth.

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May 15, 1911

Standard Oil Co. of New Jersey v. United States

The Court ordered America's dominant oil combination broken apart — and in the same decree refused to stop it selling oil while the breakup proceeded.

Affirmed, with more time

On 15 May 1911, in Standard Oil Co. of New Jersey v. United States, the Supreme Court affirmed a federal circuit-court decree holding that Standard Oil's centralised stock ownership was an unlawful restraint of trade and an attempt to monopolise under Sections 1 and 2 of the Sherman Antitrust Act.

The Court upheld dissolution through the transfer of subsidiary stock away from Standard Oil of New Jersey and barred the participants from recreating the combination. It also extended the compliance period from 30 days to at least six months.

And it removed the provision that would have stopped Standard and its subsidiaries from conducting interstate commerce while dissolution was pending, so the petroleum supply would not be disrupted. Nothing split apart on 15 May itself.

The rule of reason arrives

Chief Justice Edward Douglass White's principal opinion applied the "rule of reason", reading the Sherman Act as prohibiting undue or unreasonable restraints rather than every conceivable restraint of trade.

Justice John Marshall Harlan agreed that Standard Oil had violated the Act but objected in a separate opinion to introducing that interpretation.

The decision was at once a major antitrust victory and the source of the more permissive rule-of-reason doctrine.

The company list in the listing

Thirty-four is the conventional count of independent companies after the breakup, the figure the Library of Congress uses; the decree itself found 38 corporate defendants — Standard Oil of New Jersey plus 37 controlled companies. Totals of 33, 34, 38 and 39 all circulate, depending on what is counted.

Exxon, Mobil and Chevron were not names in existence in 1911; they are later descendants or brands of Jersey Standard, Socony and Standard Oil of California. Texaco was founded independently in 1901 and was never a Standard Oil breakup company, though it merged with Chevron decades later.

The article the corpus carries under this date is about the European Central Bank and has no factual connection to Standard Oil, the Sherman Act or this decision.

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What the sources leave uncertain

Sources use different totals—often 33, 34, 38 or 39—because they count the parent, subsidiaries, dismissed defendants and resulting independent entities differently. The Library of Congress uses the conventional figure of 34 independent companies.
Modern names such as Exxon, Mobil and Chevron did not exist in 1911; they are later corporate descendants or brands.

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December 14, 1911

Amundsen's South Pole expedition

All five men put their frostbitten hands on the same flagpole, so no single explorer could claim the planting for himself.

Five hands on one pole

At approximately 3 p.m. on 14 December 1911, Roald Amundsen halted the Norwegian polar party where its dead reckoning indicated it had reached the geographical South Pole. With him were Olav Bjaaland, Helmer Hanssen, Sverre Hassel and Oscar Wisting.

All five grasped the flagpole and planted the Norwegian flag together. Amundsen named the surrounding plateau for King Haakon VII.

After camp was erected that day, Hanssen killed the exhausted sled dog Helge; Amundsen recorded that the dog was then portioned out as food for the remaining dogs.

Arriving was not the same as knowing

The men understood that their instruments and reckoning could not establish the exact mathematical point immediately. That afternoon they traversed the vicinity, and systematic astronomical observations and further positioning work continued over the following days, including 24 hours of hourly observations at Polheim on 16–17 December.

The Polheim tent, the records and the letter for Robert Falcon Scott were left behind when the party departed on 17 December.

Accounts that put the flag, the tent and the letter in one moment are compressing three days.

Thirty-four days, and news that waited until March

Scott's party reached the Pole on 17 January 1912 — 34 elapsed days later, though some popular accounts say 35 by inclusive counting — and found the Norwegians' flag, tent and letter.

Amundsen called the Pole his main objective, but the wider Fram expedition also produced meteorological, geographical, geological, astronomical and oceanographic observations, so "focused solely on reaching the pole" overstates it.

The outside world did not learn of the success until Amundsen reached Hobart in March 1912.

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What the sources leave uncertain

The date is secure. The principal qualification concerns position: Amundsen knew on December 14 that dead reckoning could not prove he stood on the exact mathematical point, so the party conducted systematic observations and traverses through December 17.
December 14 and January 17 are 34 elapsed days apart. Some popular accounts call Scott’s arrival 35 days later by inclusive counting.

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1912

Prague Conference

Two Mensheviks attended the meeting routinely described as the moment the Bolsheviks broke away from the Mensheviks.

January 5 and January 18, the same morning

The Sixth All-Russia Conference of the Russian Social Democratic Labour Party opened in Prague, Austria-Hungary, on 18 January 1912 in the Gregorian calendar — 5 January under the Julian calendar then used in Russia.

Vladimir Lenin represented the editorial board of the party's central newspaper, opened the meeting and drafted its principal resolutions. The Russian Organising Commission had convened it after tsarist repression and factional conflict left the RSDLP Central Committee effectively defunct.

The gathering was overwhelmingly Bolshevik, but two "pro-Party" Mensheviks also attended.

It claimed the party rather than leaving it

Lenin's delegates did not announce that they were quitting the RSDLP. The conference constituted itself as the general RSDLP conference and the party's supreme authority.

Its resolution on liquidationism said the Nasha Zarya and Dyelo Zhizni group had placed itself outside the party — a specified group, not every person identified as a Menshevik.

A conference resolution claimed to have united more than twenty organisations.

One day, or thirteen

18 January was only the opening. The session ran to 30 January Gregorian, and the decisions attributed to "the Prague Conference" accumulated across it: a new Bolshevik-controlled Central Committee, a Russian Bureau and revised organisational rules.

Historians commonly treat this as the effective creation of a separate Bolshevik party organisation, while noting that Lenin's organisation kept using the RSDLP name and that Menshevik and other anti-Lenin groups held their own conference in Vienna in August 1912.

The factions that had emerged in 1903 reunited organisationally at the 1906 Unification Congress, and efforts to maintain common party bodies continued through 1910.

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Date corrected. The research places this at 1912-01-18.

What the sources leave uncertain

January 18 was only the opening day. The resolutions and organizational changes attributed to the “Prague Conference” accumulated over its January 18–30 Gregorian session.
The calendar conversion is not disputed: contemporary Russian dates were January 5–17 Julian, equivalent to January 18–30 Gregorian.
Interpretation is contested. The conference called itself the supreme authority of the existing RSDLP and its formal resolution targeted “liquidators,” not every Menshevik. Historians nevertheless commonly regard the 1912 parallel Bolshevik and Menshevik conferences as producing two effective parties.

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June 19, 1913

Natives Land Act, 1913

The law was signed on 16 June but did not bite until it appeared in the Gazette three days later. Sol Plaatje wrote that Black South Africans awoke the next morning "a pariah" in their own birthplace.

Signed on the 16th, in force on the 19th

Act No. 27 of 1913 was gazetted on 19 June 1913 and immediately came into operation. Parliament had already passed it, and Governor-General Lord Gladstone had signed it three days earlier, on 16 June.

The listing describes 19 June as the day Parliament passed the Act. It was the day of gazetting and commencement — publication in the Gazette was the legal trigger.

Sol Plaatje, the journalist and South African Native National Congress leader who documented the Act's passage and early effects, wrote that the next morning Black South Africans awoke as "a pariah" in their own birthplace.

What the Act made criminal

From commencement, a Black African could not purchase, hire or otherwise acquire land or land rights from a person classified as non-Black outside the scheduled areas without the Governor-General's approval, with a reciprocal restriction on non-Black acquisition inside those areas.

Transactions newly made in contravention were void from the outset, and taking part in a prohibited purchase, sale, hire or lease became a criminal offence: a fine of up to £100, up to six months' imprisonment with or without hard labour for defaulting on it, and up to £5 a day for a continuing offence.

The scheduled areas contained about 7 percent of South Africa. The familiar 13 percent figure belongs to the 1936 Native Trust and Land Act, not to the 1913 schedule.

What it did not do on the day

The Act did not transfer every acre outside the scheduled areas to white owners on 19 June. It restricted future acquisition, hiring and occupation while preserving categories of existing rights — section 8 protected lawful purchases and hiring arrangements made before commencement, and the voiding rule applied to transactions made in contravention of the Act.

Municipal areas, inheritance, certain pre-existing agreements and some townships were expressly excepted. Section 4 tied the power to acquire or expropriate land to areas recommended under a commission process and to money voted by Parliament, and the Act ordered the Governor-General to appoint that commission to recommend and map the reserved areas.

Plaatje reported that the practical crisis became apparent toward the end of June, when expiring farm tenancies could not lawfully be replaced or registered.

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What the sources leave uncertain

The date is secure, but the listed description is mistimed: 19 June was the gazetting and commencement date, not the day Parliament passed the bill. Royal assent was given on 16 June.

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October 29, 1914

Black Sea Raid

Two of the ships flying Ottoman flags were still German-manned vessels, commanded by the German admiral who had brought them to Constantinople.

Four ports, no declaration

On 29 October 1914 a combined Ottoman naval force of eleven warships, commanded by German Rear Admiral Wilhelm Souchon, attacked Russian ships and the ports of Sevastopol, Odessa, Novorossiysk and Feodosia without any prior declaration of war.

The force included the former German warships Goeben and Breslau, renamed Yavuz Sultan Selim and Midilli but still carrying German crews and serving under Souchon.

At Odessa before dawn, three torpedo boats sank the Russian gunboat Donetz; a contemporary diplomatic report also recorded damage to shipping, the town and a sugar factory, with deaths and injuries.

Ordered around a divided cabinet

İsmail Enver Pasha, the Ottoman minister of war, had instructed Ottoman captains to follow Souchon's instructions and supported action against Russia without a prior declaration. The Ottoman cabinet itself remained divided over entering the war.

Renaming Goeben and Breslau had not made them conventionally Ottoman-crewed ships. In practice they remained German possessions and kept their German crews.

The Ottoman government initially claimed that Russian forces had attacked first; scholarship describes that account as a manufactured justification.

The declarations came days later

The listing folds the raid and the Allied declarations into one line, and the corpus article places the shelling in November. The raid was on 29 October; Russia declared war on 2 November, and Britain and France on 5 November.

Most modern reference works date Russia's declaration to 2 November, though some Turkish scholarship gives 3 November. That disagreement does not touch the raid's own date.

That date is Gregorian: contemporary Russian records used 16 October under the Julian calendar, and Ottoman records 16 Teşrin-i Evvel under the Rumi calendar.

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What the sources leave uncertain

29 October is the Gregorian date. Contemporary Russian records used 16 October under the Julian calendar, and Ottoman records used 16 Teşrin-i Evvel under the Rumi calendar.
Most modern reference works date Russia’s declaration to 2 November Gregorian, although some Turkish scholarship gives 3 November. This does not affect the raid’s securely established 29 October date.

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February 25, 1915

Labour battalions (Ottoman Empire)

The measure carried a bloodless bureaucratic title — "Increased Security Precautions" — and a number: 8682.

Order No. 8682

On 25 February 1915 the Ottoman General Staff released İsmail Enver Pasha's Directive No. 8682, titled "Increased Security Precautions."

It called for ethnic Armenian soldiers and officers to be removed from command posts and headquarters staffs. The order was justified as a security measure against alleged Armenian disloyalty and possible defection to Russia.

The immediate military context was the Ottoman defeat at Sarıkamış, a campaign Enver had commanded and then publicly blamed on Armenian treachery.

A directive, not a completed transfer

The listing says that on this date the Ottoman Empire transferred Armenians from its armed forces to unarmed labour battalions. The document was issued on 25 February; the broad disarmament and physical transfer of servicemen unfolded from late February onward.

Scholarly summaries vary on the directive's exact reach. Some emphasise removal from command and headquarters positions, while broader exclusion from armed service characterised how it was implemented.

Ottoman labour battalions already existed before the directive, and some non-Muslim conscripts were already performing rear-area labour.

What disarmament meant for the men

Armenian servicemen were not simply discharged. Many remained under military control but without arms, doing exhausting logistics work — the same army that depended on labour battalions for roads, railways and moving ammunition imposed conditions that killed many of its own labourers.

The measure stripped the men of weapons and military protection, and deprived Armenian communities of potential defenders. By late March, sources record sporadic murders of Armenian labour-battalion conscripts.

Scholarship finds that Armenian soldiers' actual loyalty or conduct did not determine how the measure was applied.

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What the sources leave uncertain

The date of Directive No. 8682 is well supported. The uncertainty is in the listed event’s scope: the document was issued on 25 February, while the broad disarmament and physical transfer of servicemen unfolded from late February onward.
Scholarly summaries vary in describing the directive’s exact reach—some emphasize removal from command and headquarters positions, while broader exclusion from armed service characterized its implementation.

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April 22, 1915

Second Battle of Ypres

The German engineers waited through seven aborted attempts for the wind to turn — then opened 5,730 cylinders buried along six kilometres of trench.

A green-yellow cloud, not an invisible one

In the late afternoon of 22 April 1915, near Langemarck north of Ypres in Belgium, German specialist troops released about 150 tons of chlorine from cylinders along roughly six kilometres of front.

The cloud was conspicuous: witnesses and historical accounts describe it as green-yellow, not invisible. It struck the French 45th Algerian Division to the Canadians' left, and soldiers suffocated or fled with burning eyes and throats.

A gap several kilometres wide opened in the line, exposing the Canadian flank.

An opening the attackers were not ready for

German infantry advanced behind the cloud, but the German command had not provided enough reserves to exploit the unexpected breakthrough. After about two kilometres the attackers were checked by an improvised Allied response.

By evening German forces had captured more than 1,800 French and 10 British unwounded prisoners, over 51 guns and about 70 machine guns, with a wide gap still open.

Urine-soaked cloths were a documented emergency expedient when anti-gas solution ran out, but they were not an effective respirator; the line held through several interacting factors, including German delay, inadequate German reserves, Allied repositioning and counterattacks.

First at this scale, not first of the war

This was the first large-scale battlefield use of lethal poison gas, not the beginning of chemical warfare. France had used tear-gas grenades in 1914, and Germany had already fired irritant shells at Neuve-Chapelle and Bolimów.

The 22 April cloud primarily struck French colonial and territorial formations. The better-known direct gas attack on Canadian positions came on 24 April.

Casualty figures are disputed: modern scholarly estimates commonly give roughly 1,000–1,100 deaths and 4,000–7,000 injuries, while older claims of 5,000 dead and 15,000 casualties may combine the attacks of 22 and 24 April and are probably inflated.

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What the sources leave uncertain

The date and nature of the attack are secure, but casualty figures are highly disputed. Modern scholarly estimates commonly give roughly 1,000–1,100 deaths and 4,000–7,000 injuries; older claims of 5,000 deaths and 15,000 total casualties may combine the attacks of 22 and 24 April and are probably inflated.
Sources variously describe a six-, 6.5- or seven-kilometre release front, reflecting measurement and rounding differences.

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February 21, 1916

Battle of Verdun

At 7:15 a.m. roughly 1,200 German guns began firing. The French survivors did not face German infantry until nearly five in the afternoon.

Nine hours of shelling, then infantry

At 7:15 a.m. on 21 February 1916, German artillery opened a massive bombardment against French forts, trenches and the city of Verdun, beginning the offensive known as Operation Gericht. Roughly 1,200 guns fired approximately 350,000 shells that day.

German infantry attacked only at about 4:45 p.m., on the front from Haumont Wood to Ornes, north of Verdun on the east bank of the Meuse.

The battle did not begin with an infantry rush. Most of 21 February was artillery fire.

Bois des Caures still held at nightfall

At Bois des Caures, the 56th and 59th French Chasseurs battalions under Lieutenant-Colonel Émile Driant survived the barrage and still held the wood that evening. They were forced to withdraw only after renewed fighting on 22 February, during which Driant was killed.

Haumont Wood was lost by nightfall, but the opening attack produced limited gains rather than a break in the French front.

Fort Douaumont — the position most often attached to the opening disaster — was not taken that day; German troops occupied it without a fight on 25 February.

Two claims to hold at arm's length

Philippe Pétain was not directing the defence on 21 February. He was appointed after the opening crisis, on 26 February.

Falkenhayn later wrote that he had intended to bleed France white. The French Ministry of Armed Forces' Bois des Caures history notes that surviving contemporary planning documents do not corroborate that postwar formulation, so it should not be presented as his original plan.

Published totals for guns and shells also vary according to the frontage measured and the categories of artillery counted.

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What the sources leave uncertain

The date and opening time are well established.
Falkenhayn later wrote that he had intended to bleed France white. The French Ministry of Armed Forces’ Bois des Caures history notes that surviving contemporary planning documents do not corroborate that postwar formulation, so it should not be presented as an uncontested fact about his original plan.
Published totals for guns and shells vary according to the geographical frontage and categories of artillery counted.

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December 18, 1916

Second Offensive Battle of Verdun

The day remembered as the end of Verdun was not an armistice. It was the day the French stopped their last 1916 offensive, at a farm called Chambrettes.

A farm called Chambrettes

On 18 December 1916, French forces completed the offensive begun on 15 December on the right bank of the Meuse, capturing the Chambrettes farm and ending the operation.

In those three days, four French divisions — supported by 886 assembled guns and directed by Charles Mangin under Second Army commander Robert Nivelle — recovered Louvemont and Bezonvaux and cleared ground in front of Forts Douaumont and Vaux.

They took 11,387 German prisoners, 115 artillery pieces, 44 Minenwerfer and 107 machine guns.

"German troops defeated" overshoots

The German line was pushed back from the recovered forts and many German troops were captured, but the German army was neither destroyed nor removed from every position around Verdun.

The French had not recovered every 1916 loss either: Germany still held Mort-Homme and Côte 304 on the west bank until the French offensive of 1917, and fighting in the region continued through 1917 and 1918.

The forts themselves had been recovered earlier — Douaumont on 24 October, Vaux re-entered on 3 November after a German evacuation — not during the December attack.

Where the endpoint comes from

The French Ministry of Armed Forces' chronology treats the cessation of this offensive on 18 December as the end of the 1916 battle. Oxford Bibliographies dates the end of the final counterattack to 19 December, so the endpoint is not uniform across scholarship.

Counting 21 February through 18 December inclusively gives 302 calendar days, and French institutional histories commonly round that to 300. The frequently quoted 303 days is not supported by the listed dates.

The Verdun Memorial records approximately 700,000 French and German casualties during 1916, which makes the widely repeated 700,000–1,000,000 range inflated at its upper bound.

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Traditional date. This date is the conventional one, not one fixed by a contemporary record.

What the sources leave uncertain

French official and commemorative histories conventionally end the battle on 18 December, when the offensive stopped. Oxford Bibliographies dates the end of the final counterattack to 19 December, so the endpoint is not entirely uniform across scholarship.
The phrase German troops defeated is broader than the evidence warrants. German positions were driven back and many troops captured, but the German army was not destroyed or removed from the entire Verdun sector.
Counting 21 February through 18 December inclusively gives 302 calendar days; institutional histories commonly use the rounded expression 300 days.

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1916

Sykes–Picot Agreement

The two diplomats whose names the agreement carries were not its formal signatories. The decisive papers passed between Edward Grey and Paul Cambon.

Two notes, nine days apart

The Sykes–Picot Agreement was not a single treaty signed on one day in 1916. Mark Sykes and François Georges-Picot initialled a memorandum in January; French ambassador Paul Cambon sent France's note and the agreed map to London on 9 May; and British Foreign Secretary Edward Grey replied on 16 May, completing the exchange.

Grey's reply is what recorded the two governments' acceptance of the arrangements.

Nothing changed on the ground that day, and neither the Ottoman authorities nor the affected Arab populations were publicly informed.

Three legal categories, not two empires

The agreement contemplated an independent Arab state or confederation in areas A and B, but gave France priority for advisers, enterprise and loans in A, and Britain the same privileges in B. Separately it permitted French direct or indirect control in a blue coastal and Anatolian zone, and British direct or indirect control in a red Mesopotamian zone.

Most of Palestine was coloured brown and assigned to a future international administration rather than directly to Britain, which was separately accorded Haifa and Acre.

The text also regulated ports, customs, water and railways, including a British right to build and control a railway connecting Haifa with the British sphere.

What it left unsettled

Russia was consulted and assented through related diplomacy, but Italy had not been fully informed in May 1916 — the agreement's own text says Italian claims still required practical consideration. Russian claims to Constantinople, the Straits and Armenian territory came through separate wartime agreements.

The proposed zones do not correspond neatly to the later borders of Syria, Iraq, Jordan, Lebanon, Israel or Turkey, and the plan was never implemented in its original form.

Sharif Hussein bin Ali, whose representatives the text said were to be consulted about the international administration in Palestine, was not informed of the secret agreement when it was concluded; how it squares with the Hussein–McMahon correspondence remains disputed among scholars.

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Date corrected. The research places this at 1916-05-16.

What the sources leave uncertain

The agreement was not a single treaty signed by Sykes and Picot on one day. The negotiators initialled a memorandum in January; Cambon sent the French note on 9 May; Grey’s acceptance of 16 May completed the exchange.
Russia was consulted and assented through related diplomacy. Italy, however, had not been fully informed in May 1916; the agreement itself says Italian claims still required practical consideration.
Modern country names only approximate the colored zones. The proposed areas do not correspond neatly to the later borders of Syria, Iraq, Jordan, Lebanon, Israel or Turkey.

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1917

Michael Alexandrovich of Russia

The document remembered as a refusal never renounced the crown. It postponed acceptance until an assembly elected by universal, direct, equal and secret ballot decided.

Not yes, not no

In Petrograd on 3 March 1917 under Russia's Julian calendar — 16 March in the Gregorian calendar — Grand Duke Michael Alexandrovich signed a declaration responding to Nicholas II's attempt to transfer the throne to him.

He did not accept supreme power. He stated that he would assume it only if a Constituent Assembly elected by universal suffrage expressed the people's will in favour of doing so.

He signed the document simply "Mikhail".

The government already existed

Michael called on citizens to obey the Provisional Government, which his declaration described as formed on the State Duma's initiative and invested with full power pending the Constituent Assembly.

That government was not created by him that day. The Duma's Temporary Committee had organised it the previous day — 2 March Old Style, 15 March New Style — with Prince Georgy Lvov as prime minister and interior minister.

Its programme, published in Izvestiia on 3/16 March, promised preparations for a Constituent Assembly elected by universal, direct, equal and secret vote.

What the declaration did not settle

No Romanov assumed active sovereign power, and imperial rule ended in practice. Whether Michael briefly became emperor is disputed, because Nicholas's exclusion of his son Alexei, the absence of Michael's acceptance and the revolutionary collapse of imperial institutions left the constitutional questions unresolved.

Russia was not formally proclaimed a republic on this date. That declaration came under the Provisional Government in September 1917.

The Provisional Government was the formal executive authority, but it operated alongside the powerful Petrograd Soviet in the emerging arrangement later called dual power.

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Date disputed. Sources disagree; the research places it at 1917-03-16.

What the sources leave uncertain

The dual date is secure: 3 March 1917 in the Julian calendar then used officially in Russia equals 16 March in the Gregorian calendar.
The legal characterization is disputed. The declaration did not use an unconditional formula of abdication or refusal; it said Michael would accept supreme power if a popularly elected Constituent Assembly authorized it.
Whether Michael briefly became emperor is also disputed because Nicholas’s exclusion of Alexei, the absence of Michael’s acceptance, and the revolutionary collapse of imperial institutions created unresolved constitutional questions.
Russia was not formally proclaimed a republic on this date; that declaration came under the Provisional Government in September 1917.