Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years, though with the majority of recorded apparitions (25 of 30) occurring after 75–77 years. It last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. Officially designated 1P/Halley, it is also commonly called Comet Halley, or sometimes simply Halley. Halley's periodic returns to the inner Solar System have been observed and recorded by astronomers around the world since at least 240 BC, but it was not until 1705 that the English astronomer Edmond Halley understood that these appearances were re-appearances of the same comet.
19th recorded perihelion passage of Halley's Comet
Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years, though with the majority of recorded apparitions (25 of 30)...
Historical Significance
Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years, though with the majority of recorded apparitions (25 of 30) occurring after 75–77 years.
Events Before
Possible date for establishment of the Iroquois (Haudenosaunee) League [disputed date - other research places date betwe
Possible date for establishment of the Iroquois (Haudenosaunee) League [disputed date - other research places date between 1450 and 1660]
Cardinal Guido elected Pope Coelestinus II
Cardinal Guido elected Pope Coelestinus II
King Alfonso VII of Leon recognises Portugal as a Kingdom
Alfonso VII (1 March 1105 – 21 August 1157), called the Emperor (el Emperador), became the King of Galicia in 1111 and King of León and Castile in 1126.
Gherardo Caccianemici is elected Pope Lucius II, succeeding Celestine II
Pope Lucius II (died 15 February 1145), born Gherardo Caccianemici dal Orso, was head of the Catholic Church and ruler of the Papal States from 9 March 1144 to his death in 1145.
Basilica of St Denis is dedicated near Paris, the first fully Gothic church
Basilica of St Denis is dedicated near Paris, the first fully Gothic church
Events After
Bernard of Clairvaux preaches his famous sermon in a field at Vézelay, urging the necessity of a Second Crusade. Louis V
Bernard of Clairvaux preaches his famous sermon in a field at Vézelay, urging the necessity of a Second Crusade. Louis VII and Eleanor of Aquitaine are present and join the Crusade.
European leaders outlaw the crossbow, intending to end war for all time
European leaders outlaw the crossbow, intending to end war for all time
Jewish community in Cologne fasts to commemorate anti-Jewish violence
Jewish community in Cologne fasts to commemorate anti-Jewish violence
King Afonso I of Portugal occupies Lisbon
Dom Afonso I nicknamed "the Conqueror" (Portuguese: O Conquistador), "the Founder" (O Fundador) and "the Great" (O Magno) by the Portuguese, was the first king of Portugal, from 26 July 1139 until...
Pope Eugene III takes refuge in the castle of Ptolemy II of Tusculum
Pope Eugene III takes refuge in the castle of Ptolemy II of Tusculum
More from the 1140s
Bernard of Clairvaux preaches his famous sermon in a field at Vézelay, urging the necessity of a Second Crusade. Louis V
Bernard of Clairvaux preaches his famous sermon in a field at Vézelay, urging the necessity of a Second Crusade. Louis VII and Eleanor of Aquitaine are present and join the Crusade.
European leaders outlaw the crossbow, intending to end war for all time
European leaders outlaw the crossbow, intending to end war for all time
Possible date for establishment of the Iroquois (Haudenosaunee) League [disputed date - other research places date betwe
Possible date for establishment of the Iroquois (Haudenosaunee) League [disputed date - other research places date between 1450 and 1660]
Wrongful execution of noted Song Dynasty General Yue Fei
Yue Fei, courtesy name Pengju (鵬舉), was a Chinese military general of the Song dynasty and is remembered as a patriotic national hero, known for leading its forces in the wars in the 12th century...
Frequently Asked Questions
- What happened on April 22, 1145?
- Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years, though with the majority of recorded apparitions (25 of 30) occurring after 75–77 years. It last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. Officially designated 1P/Halley, it is also commonly called Comet Halley, or sometimes simply Halley.
- Why is 19th recorded perihelion passage of Halley's Comet significant?
- Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years, though with the majority of recorded apparitions (25 of 30) occurring after 75–77 years.