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21:35 at Jiuquan

A Long March 1 rocket lifted off from the Jiuquan Satellite Launch Center at 21:35 Beijing time on 24 April 1970 carrying Dong Fang Hong 1, a 173-kilogram spacecraft. It reached its planned orbit at about 21:48.

The satellite transmitted telemetry and the melody “The East Is Red” on 20.009 MHz. At 21:50 China’s state broadcasting authority reported receiving the musical transmission clearly.

Two sets of orbital numbers

Published elements differ because they come from different early tracking solutions. CNSA gives a 441-kilometre perigee, a 2,368-kilometre apogee and 68.44° inclination; NASA’s contemporary chronology gives 439 by 2,387 kilometres, a 114-minute period and 68.4°.

The operating duration is shakier still. One CNSA page says the spacecraft worked 28 days while also giving 14 May as the date it stopped transmitting — about 20 days after launch. The last-signal date is the better-supported figure.

A demonstration, not an observatory

Official accounts describe the mission’s work as orbital tracking, engineering verification and the music broadcast. The dedicated space-physics instruments flew later, on Shijian 1.

The bright object skywatchers could most easily follow was not the satellite: a roughly 40-square-metre optical reflector was deployed from the Long March 1 third stage to make that stage visible.

The flight made China the fifth country — after the Soviet Union, the United States, France and Japan — to orbit a satellite on an independently developed launch vehicle.

Nothing was founded on 31 May 1971

The listing has this date wrong. No declaration creating Bangladesh was issued on 31 May 1971; the formal Proclamation of Independence is dated 10 April 1971 and confirmed Sheikh Mujibur Rahman’s declaration of 26 March.

The May date circulates in derivative online chronologies, and it conflicts with Bangladesh’s own constitutional text and with contemporary diplomatic records.

What was actually said

At a press conference that day, the Bengali nationalist leader Maulana Abdul Hamid Khan Bhashani rejected proposals for a negotiated political settlement and described the conflict as a popular revolt against West Pakistani exploitation.

In New Delhi, the Bangladesh government’s press attaché Amjadul Haque said his government would reject any settlement preserving a united Pakistan, maintaining that Bangladesh was already a free, sovereign country at war.

That was diplomatic advocacy asserting an existing sovereignty, not a second constitutional declaration.

The three dates that carry the legal weight

Mujib’s declaration is dated 26 March. Elected Bengali representatives issued the formal Proclamation on 10 April, constituted themselves as a constituent assembly, and made the instrument effective from 26 March.

The provisional government took its oaths publicly on 17 April at Baidyanathtala — renamed Mujibnagar — with Syed Nazrul Islam acting for the imprisoned Mujib and Tajuddin Ahmad as prime minister.

The fact sheet’s own recommendation is to redate the entry to 10 April or retitle it to describe the 31 May rejection of compromise.

Two TENEX machines, side by side

In late 1971, at Bolt Beranek and Newman in Cambridge, Massachusetts, Ray Tomlinson modified the TENEX program SNDMSG with code lifted from the experimental file-transfer program CPYNET, so it could append a message to a mailbox on another ARPANET host.

He tested it by sending to himself between two TENEX computers that stood next to each other but whose only computer-to-computer link ran through the ARPANET. The work came to roughly 400 added lines of assembly and, by his own estimate, three or four working days spread over a couple of weeks.

Why the date stays vague

Tomlinson consistently dated the tests only to “late 1971.” No surviving record fixes a day or a month, which is why the entry belongs at year-level precision.

The content of the first successful message is unknown too. He sent many partial and complete tests and could not say which one first crossed intact; “QWERTYUIOP” was his example of the sort of meaningless string he might have typed, not a preserved quotation.

The @ sign, and what “first” means here

Tomlinson introduced the user@host form, picking “@” because it read as a user being located “at” another machine. He did not invent the character; he repurposed one already on the keyboard.

Nor did he invent electronic mail. Messaging between users of a single computer existed years earlier — SNDMSG itself was one such program — so the claim holds only for mail between users on different hosts.

Once the tests worked he used the new system to tell his colleagues how to send network mail, and the capability shipped to other TENEX sites in the next release in early 1972.

The AP story runs, 25 July 1972

On 25 July 1972 the Washington Star published Associated Press reporter Jean Heller’s investigation: the U.S. Public Health Service had followed Black men with syphilis in Alabama for four decades while withholding proper treatment. The report reached the New York Times front page the next morning.

It rested on documents supplied by Peter Buxtun, a former Public Health Service investigator who had raised ethical objections internally, and passed to Heller through AP reporter Edith Lederer. Heller was 29.

“Admitted” overstates what officials said

The day’s event was a press exposure, not a government confession. Officials Heller interviewed acknowledged serious moral problems and said the study should have ended once penicillin was available — while also arguing in 1972 that treating the elderly survivors was medically questionable.

“Human guinea pigs” was Heller’s characterisation, not a phrase officials collectively adopted. The story did not stop the study either: a federal ad hoc panel recommended termination in October and the government announced the end in November.

Numbers that still do not agree

The cohort recruited in 1932 was 600 Black men — 399 with syphilis and 201 without, as a comparison group. Seventy-four untreated syphilitic participants were still alive at the beginning of 1972.

Heller’s contemporary report cited seven deaths directly attributed to syphilis and 154 heart-disease deaths whose relationship to the disease officials could not determine. Later accounts commonly give 28 direct deaths, 100 related deaths, 40 infected wives and 19 congenital cases; Johns Hopkins describes at least 16 attributable deaths, and other scholarship holds that the family totals are not securely known.

Beijing, 29 September 1972

Japan and the People’s Republic of China issued their Joint Communiqué in Beijing on 29 September 1972, closing negotiations that involved Japanese prime minister Kakuei Tanaka and foreign minister Masayoshi Ohira on one side and premier Zhou Enlai and foreign minister Ji Pengfei on the other.

The text ran to nine numbered operative provisions. It terminated the “abnormal state of affairs” between the two governments and made diplomatic relations effective that day — not in 1973, as some summaries have it. Tanaka’s visit ran 25–30 September, and he had met Mao Zedong on the 27th.

Two carefully chosen verbs about Taiwan

Japan recognized the PRC government as the sole legal government of China, which ended Japan’s official relations with the government of the Republic of China in Taipei.

On Taiwan itself the wording was deliberately asymmetric. Beijing declared Taiwan an inalienable part of the PRC; Japan said it “fully understands and respects” that position and maintained its stance under Article 8 of the Potsdam Proclamation. Japan did not adopt the stronger formulation that it recognized PRC sovereignty over Taiwan.

Reparations renounced in a single clause

The PRC renounced its demand for war reparations from Japan. The document records a renunciation of the demand — not a bilateral payment or settlement made that day.

Both governments promised peaceful settlement of disputes and further negotiations toward a peace-and-friendship treaty and practical agreements. The communiqué also directed each side to establish an embassy and exchange ambassadors quickly; Japan opened its Beijing embassy in January 1973.

Four foreign ministers in Paris

The Agreement on Ending the War and Restoring Peace in Viet-Nam was signed in Paris on 27 January 1973 by representatives of the United States, the Republic of Vietnam, the Democratic Republic of Vietnam and the Provisional Revolutionary Government.

The signatories were the foreign ministers: William P. Rogers for the United States, Trần Văn Lắm for South Vietnam, Nguyễn Duy Trinh for North Vietnam and Nguyễn Thị Bình for the PRG. Henry Kissinger and Lê Đức Thọ, who had done the negotiating, had initialed the completed text on 23 January and were not on the formal signature lines.

Engineered around a refusal

The South Vietnamese government would not recognize either North Vietnam or the PRG. So Rogers signed two nearly identical instruments, and on the four-party version the opposing Vietnamese parties signed separate pages.

The document set a ceasefire for 2400 GMT on 27 January and required the United States to cease military activity against North Vietnam. A sixty-day clock started for the withdrawal of U.S. and specified allied personnel, dismantling of bases, and return of captured military personnel and foreign civilians.

What the signature did not end

Monitoring fell to four-party and two-party joint military commissions plus an International Commission of Control and Supervision made up of Canada, Hungary, Indonesia and Poland.

The listing’s claim that U.S. involvement ended that day is too broad. American forces stayed through the sixty-day withdrawal — the last left on 29 March — and U.S. bombing in Cambodia continued until August 1973.

Nor did the fighting stop. The ceasefire-in-place provisions left large communist formations where they stood without requiring their withdrawal, and Vietnamese fighting continued from the agreement’s opening days.

The question about listening devices

At a public, televised hearing of the Senate Select Committee on Presidential Campaign Activities on 16 July 1973, former Nixon aide Alexander Butterfield confirmed that presidential conversations in the Oval Office and elsewhere had been secretly recorded at Nixon’s direction. Minority counsel Fred Thompson asked the public question; Samuel Ervin chaired.

It was not the first telling. Butterfield had disclosed the system to committee staff in a private interview on 13 July, after staff went looking for evidence that might corroborate John Dean’s account.

Wider than the Oval Office

The system Butterfield described covered meetings and telephone calls in the Oval Office, the Cabinet Room, the Executive Office Building, the Lincoln Sitting Room and Camp David. Most locations were sound-activated and tied to the presidential locator system; the Cabinet Room installation was operated manually.

The National Archives puts the resulting collection at roughly 3,700 hours of listening across 950 reels, with metadata covering 22,723 conversations recorded between 16 February 1971 and 18 July 1973.

A week to the subpoenas

Butterfield did not testify that particular conversations were known to be incriminating. What he established was that recordings existed and could corroborate or contradict Dean’s allegations, which made the tapes an evidentiary target.

The recording system was shut down on 18 July. On 23 July both the Senate committee and special prosecutor Archibald Cox subpoenaed tapes and documents.

About 14:00, 6 October 1973

Egyptian and Syrian forces opened simultaneous attacks at roughly 14:00 local time on 6 October 1973, striking Israeli positions on the Suez Canal and Sinai front and on the Golan Heights.

Egypt’s Second and Third Armies made an assault crossing of the canal, with elements of five infantry divisions establishing bridgeheads on the Israeli-held eastern bank. Syrian forces crossed the ceasefire line onto the Golan at the same hour.

Warned that morning, mobilizing that afternoon

Israel had received warning that morning that a coordinated attack was expected. Golda Meir’s government chose not to strike preemptively — chief of staff David Elazar had argued for both a preemptive strike and broader mobilization — and ordered reserve mobilization only hours before the attack.

That left Israel’s reserve-dependent army fighting defensively with mobilization incomplete.

What the listing overstates

By nightfall Egypt held bridgeheads east of the canal and Syrian forces had penetrated Israeli-held Golan territory. No major Israeli counteroffensives began that day, and the superpower airlifts came later — the first U.S. airlift aircraft reached Israel on 14 October.

In Washington, officials received reports of the fighting, convened a crisis meeting, and decided initially that no U.S. military equipment should move to either side.

“Fourth” is a conventional count rather than a settled one — scholarly works also call this the fifth major interstate round — and “largest” is an unsupported superlative without a stated measure.

The Council’s third try in four days

On 25 October 1973 the UN Security Council adopted Resolution 340, demanding an immediate and complete ceasefire and a return to the positions held at 16:50 GMT on 22 October.

It was not the first attempt. Resolution 338 had been adopted on 22 October and Resolution 339 on 23 October; Israel had continued its advance through both. This time Israel accepted.

The nuclear alert that came first

Earlier the same day, the United States placed its nuclear forces on worldwide alert after Leonid Brezhnev suggested Soviet forces might act unilaterally to enforce the ceasefire. The immediate superpower crisis subsided once Resolution 340 was adopted.

The resolution also created the Second United Nations Emergency Force under Security Council authority, supplementing the UN observers already on the ground, to supervise the ceasefire and move between the armies.

Why “the war ends” is too clean

The armies did not return to their 22 October positions merely because the resolution demanded it, and Israel’s encirclement of Egypt’s Third Army was not lifted by the vote.

Some military histories report heavy fighting on the Egyptian front into 26 October and intermittent clashes afterward, so 25 October marks an operational ceasefire rather than the end of every hostile act.

It was also not a peace: Egyptian–Israeli disengagement arrangements followed in November 1973 and January 1974.

8:00 a.m. at Pokhran

The listing carries only the year, and the article behind it claims the source gives no exact date. It does: India detonated an underground implosion-type nuclear device at Pokhran in Rajasthan at 8:00 a.m. on 18 May 1974, at a reported burial depth of more than 100 metres.

That made India the sixth country to demonstrate a nuclear-explosive capability, after the United States, the Soviet Union, the United Kingdom, France and China.

Called peaceful, by India

At 10:00 a.m. Foreign Secretary Kewal Singh informed the U.S. chargé, describing the event as a “peaceful nuclear explosion” conducted by the Indian Atomic Energy Commission to research uses such as mining and earthmoving. A public announcement that afternoon repeated that India did not intend to produce nuclear weapons.

The phrase described a declared purpose, not a technically distinct kind of detonation. Because the explosive technology was directly applicable to weapons, outside governments and many historians classify the shot as India’s first nuclear-weapons test.

A later Indian government assessment puts the yield at 12–13 kilotons; published estimates have varied, and that figure should not be treated as uncontested.

Canadian reactor, American heavy water

The device’s plutonium came from CIRUS, a Canadian-supplied research reactor whose heavy water had been supplied by the United States. Canada suspended nuclear cooperation with India after the test.

Even the familiar name is shaky. The origin of “Smiling Buddha,” and the story that “the Buddha is smiling” was the success code, are disputed; one technical history concludes the test may have had no formal pre-shot code name.

The morning of 17 April 1975

Khmer Rouge forces entered Phnom Penh on the morning of 17 April 1975 and defeated the collapsing Khmer Republic, effectively ending the Cambodian Civil War. General Mey Sichan broadcast that Khmer Republic soldiers had surrendered.

Testimony before the Khmer Rouge tribunal indicates fighting generally ceased as government soldiers gave up. Khmer Rouge troops occupied major points in the capital and disarmed the defeated army. Many residents initially welcomed the black-clad troops, believing five years of war were over.

Emptied within hours

Soldiers began forcing the city’s inhabitants into the countryside the same day. Houses and schools were emptied at gunpoint and hospital patients were driven into the streets; the estimate for the population ordered out is about two million, a figure that includes large numbers of wartime refugees sheltering in the capital.

Residents were told the removal would be temporary. Tribunal evidence established that clearing the urban population was a centrally directed revolutionary policy.

Foreign nationals and Cambodian refugees gathered inside the French Embassy as the expulsion proceeded outside its gates — not only expatriates, though many of the Cambodians there were later forced out.

The American evacuation was five days earlier

The listing folds a “mass evacuation of American troops” into this date. That was Operation Eagle Pull on 12 April; the FRUS accounting puts its final lift at 276 U.S., Cambodian and third-country nationals.

Nor did the republic relocate. The remaining government surrendered and disintegrated; Sak Sutsakhan, who chaired the seven-member Supreme Committee formed on 12 April, escaped by helicopter.

A stand-in, not a successor

On 30 October 1975 the 37-year-old Prince of Spain temporarily assumed the functions of head of state, because Francisco Franco was gravely ill. Franco remained alive and formally in office.

Calling the officeholder “Juan Carlos I” that day is anachronistic. He was Juan Carlos de Borbón, Prince of Spain; the regnal name applied only after his proclamation as king. It was also his second stint: he had covered for Franco once before, from 19 July to 2 September 1974.

The mechanism was Franco’s own law

The transfer ran through Francoist legislation. Law 26/1971 assigned the Prince of Spain the head-of-state functions that the Organic Law granted the heir during the ruler’s incapacity or absence.

Prime minister Carlos Arias Navarro pressed Juan Carlos to accept and continued to head the government. Contemporary reporting called the transfer provisional and said the prince would preside over the next day’s cabinet meeting — the same Francoist cabinet that had governed under the dictator.

Three weeks, and no new constitutional order

Juan Carlos held the temporary functions until Franco died on 20 November and was proclaimed king on 22 November. He acted under Franco’s succession laws and his oath to the Fundamental Laws.

Even Franco’s consent was unclear at the time. Modern chronologies say he ordered the transfer after being told how grave his condition was; reporting on 30 October said it was not yet known whether Franco had personally agreed.