The 2012 transit of Venus, when the planet

Venus Venus is the second planet from the Sun. It is often called Earth's "twin" or "sister" planet for having almost the same size and mass, and the closest orbit to Earth's. While both are rocky planets, Venus has an atmosphere much thicker ...

appeared as a small, dark spot passing across the face of the

Sun The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light a ...

, began at 22:09 UTC on 5 June 2012, and finished at 04:49 UTC on 6 June. Depending on the position of the observer, the exact times varied by up to ±7 minutes. Transits of Venus are among the rarest of predictable celestial

phenomena A phenomenon ( phenomena), sometimes spelled phaenomenon, is an observable Event (philosophy), event. The term came into its modern Philosophy, philosophical usage through Immanuel Kant, who contrasted it with the noumenon, which ''cannot'' be ...

and occur in pairs. Consecutive transits per pair are spaced 8 years apart, and consecutive pairs occur more than a century apart: The previous transit of Venus took place on 8 June 2004 (preceded by transits on 9 December 1874 and 6 December 1882); the next pair of transits will occur on 10–11 December 2117 and December 2125 within the 22nd century.

Observations of the event

The entire transit was visible from the western

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

, northwesternmost North America, northeastern Asia, Japan, the

Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...

, eastern Australia, New Zealand, and high

Arctic The Arctic (; . ) is the polar regions of Earth, polar region of Earth that surrounds the North Pole, lying within the Arctic Circle. The Arctic region, from the IERS Reference Meridian travelling east, consists of parts of northern Norway ( ...

locations including northernmost

Scandinavia Scandinavia is a subregion#Europe, subregion of northern Europe, with strong historical, cultural, and linguistic ties between its constituent peoples. ''Scandinavia'' most commonly refers to Denmark, Norway, and Sweden. It can sometimes also ...

, and

Greenland Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenlan ...

. In North America, the

Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...

, and northwestern South America, the beginning of the transit was visible on 5 June until sunset. From sunrise on 6 June, the end of the transit was visible from

South Asia South Asia is the southern Subregion#Asia, subregion of Asia that is defined in both geographical and Ethnicity, ethnic-Culture, cultural terms. South Asia, with a population of 2.04 billion, contains a quarter (25%) of the world's populatio ...

, the

Middle East The Middle East (term originally coined in English language) is a geopolitical region encompassing the Arabian Peninsula, the Levant, Turkey, Egypt, Iran, and Iraq. The term came into widespread usage by the United Kingdom and western Eur ...

east Africa East Africa, also known as Eastern Africa or the East of Africa, is a region at the eastern edge of the Africa, African continent, distinguished by its unique geographical, historical, and cultural landscape. Defined in varying scopes, the regi ...

, and most of

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

. The phenomenon was not visible from most of

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

, nor from western Africa. There were a number of live online video streams with footage from telescopes around the world. Midway through the transit one of the NASA streams had nearly 2 million total views and was getting roughly 90,000 viewers at any given moment. In

Los Angeles Los Angeles, often referred to by its initials L.A., is the List of municipalities in California, most populous city in the U.S. state of California, and the commercial, Financial District, Los Angeles, financial, and Culture of Los Angeles, ...

, crowds jammed Mount Hollywood where the Griffith Observatory set up telescopes for the public to view the transit. In Hawaii, hundreds of tourists watched the event on Waikiki Beach where the

University of Hawaii A university () is an educational institution, institution of tertiary education and research which awards academic degrees in several Discipline (academia), academic disciplines. ''University'' is derived from the Latin phrase , which roughly ...

set up eight telescopes and two large screens showing webcasts of the transit. The transit was also observed and historically photographed by NASA astronaut Don Pettit aboard the

International Space Station The International Space Station (ISS) is a large space station that was Assembly of the International Space Station, assembled and is maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United ...

. NASA's Solar and Heliospheric Observatory could not see the transit as it was not in between the Earth and the Sun at the time of the event, but high-definition images of the event were obtained by Solar Dynamics Observatory, from above the Earth. Agency astrophysicist Dr. Lika Guhathakurta said, "We get to see Venus in exquisite detail because of SDO's spatial resolution, SDO is a very special observatory. It takes images that are about 10 times better than a high-definition TV and those images are acquired at a temporal cadence of one every 10 seconds. This is something we've never had before".

Research

The 2012 transit gave scientists a number of research opportunities. These included: *Measurement of dips in a star's brightness caused by a known planet transiting a known star (the Sun). This will help astronomers when searching for

exoplanet An exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first det ...

s. Unlike the 2004 Venus transit, the 2012 transit occurred during an active phase of the 11-year activity cycle of the Sun, and would have provided practice in detecting a planet's signal around a "spotty"

variable star A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes systematically with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are ...

. *Measurement of the apparent diameter of Venus during the transit, and comparison with its known diameter. This will have given information on how to estimate exoplanet sizes. *The number of locations documenting the event will provide much data via

parallax Parallax is a displacement or difference in the apparent position of an object viewed along two different sightline, lines of sight and is measured by the angle or half-angle of inclination between those two lines. Due to perspective (graphica ...

that will generate more accurate measurements. *Observation of the atmosphere of Venus simultaneously from Earth-based telescopes and from the Venus Express spacecraft. This gave a better opportunity to understand the intermediate level of Venus's atmosphere than is possible from either viewpoint alone, and should provide new information about the

climate Climate is the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteoro ...

of the planet. *Spectrographic study of the atmosphere of Venus. The results of analysis of the well-understood atmosphere of Venus will be compared with studies of exoplanets with atmospheres that are unknown. *The

Hubble Space Telescope The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the Orbiting Solar Observatory, first space telescope, but it is one of the largest and most ...

used the

Moon The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar ...

as a mirror to study the light reflected from Venus to determine the makeup of its atmosphere. This may provide another technique to study exoplanets. * Experimental reconstruction of Lomonosov's discovery of Venusian atmosphere (1761) with antique refractors. The researchers observed the "Lomonosov's arc" and other aureole effects due to Venus's atmosphere and concluded that Lomonosov's telescope was fully adequate to the task of detecting the arc of light around Venus off the Sun's disc during ingress or egress if proper experimental techniques as described by Lomonosov in his 1761 paper are employed.

Gallery

North America: File:Transit of Airplane during Transit of Venus across the Sun - June 05, 2012 02.jpg,

San Francisco San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...

, California, United States
Transit of airliner with Venus File:Venus Transit from Tempe, AZ June 5, 2012.jpg, Tempe,

Arizona Arizona is a U.S. state, state in the Southwestern United States, Southwestern region of the United States, sharing the Four Corners region of the western United States with Colorado, New Mexico, and Utah. It also borders Nevada to the nort ...

, USA
01:54 UTC File:2012 Transit Of Venus Wichita Falls Texas.JPG, Wichita Falls, Texas, USA File:Fennell Observatory, Oakland, TN 35.2597°N, 89.5125°W.png, Fennell Observatory

Oakland, Tennessee Oakland is a town in Fayette County, Tennessee, United States. In 2020 the population of the town was 8,936, a gain of 417.8% since 2000, Reasons for this population boom, are the cities/counties low taxes, its low crime rate, and the 4 lane expa ...

, USA File:VenusTransit20120605Toronto.JPG,

Toronto Toronto ( , locally pronounced or ) is the List of the largest municipalities in Canada by population, most populous city in Canada. It is the capital city of the Provinces and territories of Canada, Canadian province of Ontario. With a p ...

, Ontario, Canada
23:06 UTC Europe: File:Transit of Venus 2012 Ragusa.jpg,

Ragusa, Sicily Ragusa (; ; ) is a city and ''comune'' in southern Italy. It is the capital of the province of Ragusa, on the island of Sicily, with 73,778 inhabitants as of 2025. It is built on a wide limestone hill between two deep valleys, Cava San Leonardo ...

, Italy
04:11 UTC File:Transit of Venus 2012 from Moscow.jpg,

Moscow Moscow is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents with ...

, Russia
03:47 UTC File:Venus Transit Helsingborg Sweden.jpg,

Helsingborg Helsingborg (, , ), is a Urban areas in Sweden, city and the seat of Helsingborg Municipality, Scania County, Scania (Skåne), Sweden. It is the second-largest city in Scania (after Malmö) and List of urban areas in Sweden by population, ninth ...

, Sweden
04:20 UTC File:Transit of Venus 06-06-2012.jpg, Úvaly,

Czech Republic The Czech Republic, also known as Czechia, and historically known as Bohemia, is a landlocked country in Central Europe. The country is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the south ...

04:26 UTC File:2012venustransit.jpg,

Kecskemét Kecskemét ( ) is a city with county rights in central Hungary. It is the List of cities and towns of Hungary, eighth-largest city in the country, and the county seat of Bács-Kiskun County, Bács-Kiskun. Kecskemét lies halfway between the ca ...

, Hungary
03:41 UTC Asia: File:Venus Kuwait 2012.jpg, Kuwait City, Kuwait File:2012 Transit of Venus from Amman, Jordan.jpg,

Amman Amman ( , ; , ) is the capital and the largest city of Jordan, and the country's economic, political, and cultural center. With a population of four million as of 2021, Amman is Jordan's primate city and is the largest city in the Levant ...

Jordan Jordan, officially the Hashemite Kingdom of Jordan, is a country in the Southern Levant region of West Asia. Jordan is bordered by Syria to the north, Iraq to the east, Saudi Arabia to the south, and Israel and the occupied Palestinian ter ...

Combination of 3 exposures File:Beauty Spot on Sun Transit of Venus on June 06, 2012.jpg,

Delhi Delhi, officially the National Capital Territory (NCT) of Delhi, is a city and a union territory of India containing New Delhi, the capital of India. Straddling the Yamuna river, but spread chiefly to the west, or beyond its Bank (geography ...

, India File:The 2012 transit of Venus in Guangzhou.jpg,

Guangzhou Guangzhou, Chinese postal romanization, previously romanized as Canton or Kwangchow, is the Capital city, capital and largest city of Guangdong Provinces of China, province in South China, southern China. Located on the Pearl River about nor ...

, China
00:41 UTC File:Transit of Venus for filter sequence.jpg, Photo sequence from

Taichung Taichung (, Wade–Giles: '), officially Taichung City, is a special municipality (Taiwan), special municipality in central Taiwan. Taichung is Taiwan's second-largest city, with more than 2.85 million residents, making it the largest city in Ce ...

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...

File:Анимация прохождения Венеры по Солнцу 06.06.2012.gif, Video from

Ussuriysk Ussuriysk () is a types of inhabited localities in Russia, city in Primorsky Krai, Russia, in the valley of the Razdolnaya River. The city is north of Vladivostok, the administrative center of the krai, and about from both the China–Russia bo ...

, Russia
00:08–04:43 UTC File:Transit of venus 2012 Handa Aichi movie.gif, Video from Handa, Aichi, Japan
23:36–04:50 UTC Australasia: File:IMG 2111Venus.JPG,

Sydney Sydney is the capital city of the States and territories of Australia, state of New South Wales and the List of cities in Australia by population, most populous city in Australia. Located on Australia's east coast, the metropolis surrounds Syd ...

23:25 UTC File:Transit of Venus viewed in Wagga Wagga (2).jpg, Wagga Wagga
00:49 UTC File:Transit of Venus.jpeg, Clayton
01:06 UTC Others: File:SDO%27s Ultra-high Definition View of 2012 Venus Transit.ogv, Solar Dynamics Observatory Ultra-high Definition View File:Transit of Venus, 2012 Orbital Paths.ogv, This visualization shows the orbital paths of Venus and Earth that led to this rare alignment on 5–6 June 2012 File:ISS-31 Venus passes across the face of the sun.jpg, Venus transit, seen from the

. File:Hinode Views the 2012 Venus Transit.jpg, Close-up of Venus by the Japanese Hinode spacecraft on the

Sun-synchronous orbit A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same local mean solar time. More technically, it is ...

. File:Venus Transit 2012.ogv, Visualization generated by compositing the small field-of-view, high-cadence closeups of Venus with the full-disk, low-cadence imagery from SDO.

References

External links

Venus Transit of 2012
by the

National Solar Observatory The National Solar Observatory (NSO) is a United States federally funded research and development center to advance the knowledge of the physics of the Sun. NSO studies the Sun both as an astronomical object and as the dominant external influen ...

"Transits of Venus Explained"
by ''

Sky & Telescope ''Sky & Telescope'' (''S&T'') is a monthly magazine covering all aspects of amateur and professional astronomy, including what to see in the sky tonight and new findings in astronomy. Other topics covered include: *observing guides for planets, ...

''
"Missed the Venus Transit in 2012? Watch It Online Until 2117"
by ''

PC World ''PC World'' (stylized as PCWorld) is a global computer magazine published monthly by IDG. Since 2013, it has been an online-only publication. It offers advice on various aspects of PCs and related items, the Internet, and other personal tec ...

'' * {{Venus 2012 in science

2012 2012 was designated as: *International Year of Cooperatives *International Year of Sustainable Energy for All Events January *January 4 – The Cicada 3301 internet hunt begins. * January 12 – Peaceful protests begin in the R ...

Articles containing video clips mr:शुक्राचे अधिक्रमण#इ.स. २०१२चे अधिक्रमण

Observations of the event

Research

Gallery

References

Further reading

External links