( 1990 ) carried out a radial velocity ( Doppler shift of spectral lines ) study of the star in April and May 1988, which showed variability with a frequency of the order of a few microhertz, the highest peak corresponding to 4. 3 μHz ( 2. 7 days ) with an amplitude of 60 ms < sup >− 1 </ sup >, with a frequency separation of ~ 5 μHz.

* Critchley, Julian, ' Homage to a lonely lad ', Weekend Telegraph ( UK ), 23 April 1988.

A Broadway staging in April 1988 received disastrous reviews, and closed after just two months.

A Beltane Fire Festival has been held every year since 1988 during the night of 30 April on Calton Hill in Edinburgh, Scotland and attended by up to 15, 000 people.

Desi Arnaz was born Desiderio Alberto Arnaz y de Acha III in Santiago de Cuba to Desiderio Alberto Arnaz II ( March 8, 1894-May 31, 1973 ) and his wife Dolores de Acha ( April 2, 1896-October 24, 1988 ).

1 – 2 ) ( April 1988 ), pp. 304 – 308 .</ cite >

" Rays and Fumes in the Air and in the News ", The New York Times, April 1, 1988.

This figure, set up on April 27, 1988, was commissioned by the Basque Government to commemorate the 50th anniversary of the bombing of Guernica.

The April 1988 issue of Oh!

* Article in the April 1988 issue of Oh!

On April 19, 1988, Japanese telecommunications company NTT began offering nationwide ISDN services trademarked INS Net 64, and INS Net 1500, a fruition of NTT's independent research and trial from the 1970s of what it referred to the INS ( Information Network System ).

He was promoted to colonel in April 1988, and became the Military Secretary to the Commandant of the Marine Corps in February 1989.

Kurt Georg Kiesinger (; 6 April 1904 – 9 March 1988 ) was a German politician affiliated with the Christian Democratic Union ( CDU ).

In April 1988, a joint commission for cooperation was established between Ghana and Nigeria.

* Calvin, William " Neural Darwinism: The Theory of Neuronal Group Selection ", Science, 24 June 1988, accessed April 16, 2007 ( a review of Gerald Edelman's book Neural Darwinism )

Known as a savvy dresser, he made the April 1988 cover of GQ magazine.

* Phipps, William E., Eve and Pandora Contrasted, in Theology Today, v. 45, n. 1, April 1988, Princeton: Princeton Theological Seminary.

On April 16, 1988, in Forlì, Red Brigades-PCC killed Italian senator Roberto Ruffilli, an advisor of Italian Prime Minister Ciriaco de Mita.

Roy Kelton Orbison ( April 23, 1936 – December 6, 1988 ) was an American singer-songwriter, best known for his distinctive, powerful voice, complex compositions, and dark emotional ballads.

He wed the much-younger Mary Whitaker in 1986 and they had two children, son Chesare Elan on April 25, 1988 and daughter Chianna Maria on February 2, 1991.

*" Fantasy for Fun and Profit ": an article about the company from the Austin American Statesman, April 18, 1988

On 16 April 1988, as the Intifada was raging, Abu Jihad was assassinated in his Tunis household, allegedly by an Israeli hit squad.

* April 15 – Nikolaas Tinbergen, Dutch ornithologist, Nobel Prize laureate ( d. 1988 )

* April 24 – William Sargant, British psychiatrist ( d. 1988 )

Abraham Lincoln ( February 12, 1809 – April 15, 1865 ) was the 16th President of the United States, serving from March 1861 until his assassination in April 1865.

The bill called for former President George W. Bush to recognize and use the word genocide in his annual April 24 speech which he never used.

His successor President Barack Obama has expressed his desire to recognize the Armenian Genocide during the electoral campaigns, but after being elected, has not used the word genocide in his first annual April 24 speech in 2009.

* 1960 – Forced out by the April Revolution, President of South Korea Syngman Rhee resigns after twelve years of dictatorial rule.

On April 20, Kennedy sent a memo to Vice President Lyndon B. Johnson, asking Johnson to look into the status of America's space program, and into programs that could offer NASA the opportunity to catch up.

On April 14, 1865, President Lincoln was shot and mortally wounded by John Wilkes Booth, a Confederate sympathizer, who conspired to coordinate assassinations of others, including Johnson, Ulysses S. Grant and Secretary of State William H. Seward that same night.

* " The Impeachment trial of President Johnson ", Harper's Monthly Magazine, April 1868

On April 15, 1907, President Theodore Roosevelt issued an Arbor Day Proclamation to the School Children of the United States about the importance of trees and that forestry deserves to be taught in our schools.

Ray Ivany began his position as President and Vice-Chancellor on 1 April 2009.

In April 2008, Vice President Lt. Gen. Seretse Khama Ian Khama ( Ian Khama ), son of Seretse Khama the first president, succeeded to the presidency when Festus Mogae retired.

A caretaker cabinet was appointed by the President again and served until the new pre-term parliamentary elections in April 1997.

On April 1970, US President Nixon announced to the American public that US and South Vietnamese ground forces had entered Cambodia in a campaign aimed at destroying NVA base areas in Cambodia ( see Cambodian Incursion ).

The prohibition was officially recognized as unconstitutional in April 2003, allowing Óscar Arias to run for President a second time in the 2006 Costa Rican presidential elections, which he won with approximately a 1 % margin.

Colonel Azali Assoumani seized power in a bloodless coup in April 1999, overthrowing Interim President Tadjidine Ben Said Massounde, who himself had held the office since the death of democratically elected President Mohamed Taki Abdoulkarim in November, 1998.

President Mohamed Bacar of Anjouan formed his 13-member government at the end of April, 2003.

In April 2010 during Admiral Mike Mullen's address at Columbia, President Lee C. Bollinger stated that the ROTC would be readmitted to campus if the admiral's plans for revoking the don't ask, don't tell policy were successful.

Keli McGregor President of the Rockies, was found dead on April 20, 2010.

The United States had been embarrassed publicly by the failed Bay of Pigs Invasion in April 1961, which had been launched under President John F. Kennedy by CIA-trained forces of Cuban exiles.

While his parents and older siblings left for England in April and May that year, Charles remained in Scotland, with his father's friend and the Lord President of the Court of Session, Alexander Seton, Lord Fyvie, appointed as his guardian.

Former Russian President Dmitry Medvedev and former Prime Minister of Denmark | Danish Prime Minister Lars Lokke Rasmussen hold a joint press conference, April 2010.

In April 2005, the Ecuadorian Armed Forces declared that it " withdrew its support " for the President.

Following the advice of the President of the Imperial War Council, Rüdiger Starhemberg, Eugene was offered supreme command of Imperial forces in April 1697.

The Czech President Václav Klaus rejected the term " euroscepticism ", with its purported negative undertones, saying ( at a meeting in April 2012 ) that the expressions for a eurosceptic and his opponent should be " a Euro-realist " and someone who is " Euro-naïve " ( respectively ).