Question: Thomas Welby was the 2nd bishop of the island how far east of Rio de Janeiro?

Context paragraphs:
Tomás de Aquino Ferreira da Costa: Miguel Ferreira da Costa, born 1954 in Rio de Janeiro (Brazil), known as Dom Tomás de Aquino, is the prior of the Santa Cruz monastery in Nova Friburgo (Rio de Janeiro State).  He entered the Barroux monastery (France) in 1974 and was ordained a priest in 1980.  He is a traditionalist bishop with the "Marcel Lefebvre Priestly Union" (see: SSPX resistance).  Bishops Richard Williamson and Jean-Michel Faure consecrated him a bishop, 19 March 2016, with no papal mandate.  While the Roman Catholic Church recognizes his episcopacy, it does not consider him a licitly-ordained bishop.

Thomas Welby: Thomas Earle Welby (11 July 1810 – 6 January 1899) was an English missionary, clergyman and former soldier.  The younger son of a baronet, he served in the army for eight years, but, after leaving 1837, served as a missionary in Canada, where he became a rector, and later as an archdeacon in South Africa, before going on to be consecrated as the second bishop of the island Saint Helena in the Anglican church.

Chôros No. 2: In 1920, Villa-Lobos composed a guitar piece first titled "Chôro típico", and slightly later republished as "Chôro típico brasileiro", taking his title from an improvisational genre of Brazilian instrumental popular music that originated in Rio de Janeiro in the nineteenth century.  The Portuguese word choro (pronounced [ˈʃoɾu]), means "cry" or "lament", though most music of this type is far from being sorrowful.  Four years later, at the time of his first visit to Paris, he decided to create an extended cycle of works collectively titled "Chôros".  The guitar composition became No. 1 in that series, and "Chôros No. 2" was composed in Rio de Janeiro in 1924.  The score is dedicated to Mário de Andrade.  It was premiered at the Teatro Sant'Anna in São Paulo on 18 February 1925 by Spartaco Rossi (flute), and Antenor Driussi (clarinet), as part of a concert in homage to Olívia Guedes Penteado and .  The European premiere was given by Gaston Blanquart (flute), and Louis Cahuzac (clarinet), at the Salle Gaveau in Paris on 24 October 1927, on the first of a pair of concerts devoted to works by Villa-Lobos.  The composer transcribed the work for piano in the year in which it was composed .

Central Rio de Janeiro Atlantic Forest Mosaic: The Central Rio de Janeiro Atlantic Forest Mosaic (Portuguese: "Mosaico da Mata Atlântica Central Fluminense" is a protected area mosaic in the state of Rio de Janeiro, Brazil.  The mosaic is inland, to the east of the city of Rio de Janeiro.

Battle of Rio de Janeiro (1558): The Battle of Rio de Janeiro was a battle in 1558 on the French town at Rio de Janeiro, called Henriville.  The Portuguese, though in far smaller numbers, defeated the French and made them flee to the jungle.  The French town was then burnt by Mem de Sá, the Portuguese governor.

Ilha das Cobras: Ilha das Cobras (Portuguese for "Isle of the Snakes" ), one of many Snake Islands around world, is an island located within Guanabara Bay in the city and state of Rio de Janeiro, Brazil It is east of the neighborhood Guanabara.  It is home to the Arsenal de Marinha do Rio de Janeiro base of the Brazilian Navy.

Saúde, Rio de Janeiro: Saúde is a neighborhood of Rio de Janeiro, Brazil.  Its population in 2000 was 2186.  Located on the coast, just north of the historical centre in downtown Rio, west of Praça Maua and east of Gamboa, Rio de Janeiro.  It contains several notable hospitals such as Hospital dos Servidores de Estado and Hospital Pro Matre; the name Saúde means "Health" in Portuguese.  It is marked by a large number of homes for lower middle class and numerous sheds, warehouses and depots are located in the region.

Saint Helena: Saint Helena ( ) is a volcanic tropical island in the South Atlantic Ocean, 4,000 km east of Rio de Janeiro and 1,950 kilometres (1,210 mi) west of the Cunene River, which marks the border between Namibia and Angola in southwestern Africa.  It is part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha.  Saint Helena measures about 16 by 8 kilometres (10 by 5 mi) and has a population of 4,534 (2016 census).  It was named after Saint Helena of Constantinople.

Vigário Geral massacre: The Vigário Geral Massacre ("" in Portuguese) occurred on August 29, 1993 at the "favela of" Vigário Geral, located in the north of Rio de Janeiro city.  A death squad composed of Rio Military Police was responsible for carrying out this act of violence.  The group supposedly did so out of revenge for the killing of four police officers two days prior, who were allegedly involved in the extortion of drug traffickers.  After arriving to the "favela" of Vigário Geral on August 29, 1993, the squad spent two hours traveling around wearing hoods over their heads and sporadically shooting at local residents, leaving 21 innocent people dead.  "Among the deceased were seven men playing cards in a bar and eight members of a family, including a 15-year-old girl, killed inside their home."  After the federal and Rio de Janeiro state governments commenced a series of official investigations that year, charges were brought against thirty three people: twenty-eight military policemen who were believed to belong to infamous death squad ""Cavalos Corredores"" (the "Galloping Horses"), three civil policemen and two civilian employees of the civil police.  By 1998, the number of people charged increased to the total of fifty-two, but only two had actually been convicted thus far.  Six policeman had been convicted as of 2003, yet according to a BBC newspaper published in August, only two were actually in prison as the other four were released with the expiration of the time periods for their appeal hearings.

Luiz Felipe Lampreia: Luiz Felipe Palmeira Lampreia (19 October 1941 – 2 February 2016) was a Brazilian diplomat and sociologist.  He was born in Rio de Janeiro.  Lampreia worked as a professor at Pontifical Catholic University of Rio de Janeiro.  He served as chairman of the Industry Federation of the State of Rio de Janeiro.  He created a blog during his later career called "O Globo".

Supporting paragraphs: Thomas Welby Saint Helena
Answer: 4,000 km