# Observatory

An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysics, oceanography and volcanology are examples of disciplines for which observatories have been constructed.
The term observatoire has been used in French since at least 1976 to denote any institution that compiles and presents data on a particular subject (such as public health observatory) or for a particular geographic area (European Audiovisual Observatory).

## Astronomical observatories

Astronomical observatories are mainly divided into four categories: space-based, airborne, ground-based, and underground-based. Historically, ground-based observatories were as simple as containing a mural instrument (for measuring the angle between stars) or Stonehenge (which has some alignments on astronomical phenomena).

### Ground-based observatories

Ground-based observatories, located on the surface of Earth, are used to make observations in the radio and visible light portions of the electromagnetic spectrum. Most optical telescopes are housed within a dome or similar structure, to protect the delicate instruments from the elements. Telescope domes have a slit or other opening in the roof that can be opened during observing, and closed when the telescope is not in use. In most cases, the entire upper portion of the telescope dome can be rotated to allow the instrument to observe different sections of the night sky. Radio telescopes usually do not have domes.
For optical telescopes, most ground-based observatories are located far from major centers of population, to avoid the effects of light pollution. The ideal locations for modern observatories are sites that have dark skies, a large percentage of clear nights per year, dry air, and are at high elevations. At high elevations, the Earth's atmosphere is thinner, thereby minimizing the effects of atmospheric turbulence and resulting in better astronomical "seeing". Sites that meet the above criteria for modern observatories include the southwestern United States, Hawaii, Canary Islands, the Andes, and high mountains in Mexico such as Sierra Negra. Major optical observatories include Mauna Kea Observatory and Kitt Peak National Observatory in the US, Roque de los Muchachos Observatory in Spain, and Paranal Observatory and Cerro Tololo Inter-American Observatory in Chile.
Specific research study performed in 2009 shows that the best possible location for ground-based observatory on Earth is Ridge A — a place in the central part of Eastern Antarctica. This location provides the least atmospheric disturbances and best visibility.

#### Radio observatories

Beginning in 1933, radio telescopes have been built for use in the field of radio astronomy to observe the Universe in the radio portion of the electromagnetic spectrum. Such an instrument, or collection of instruments, with supporting facilities such as control centres, visitor housing, data reduction centers, and/or maintenance facilities are called radio observatories. Radio observatories are similarly located far from major population centers to avoid electromagnetic interference (EMI) from radio, TV, radar, and other EMI emitting devices, but unlike optical observatories, radio observatories can be placed in valleys for further EMI shielding. Some of the world's major radio observatories include the Very Large Array in New Mexico, United States, Jodrell Bank in the UK, Arecibo in Puerto Rico, Parkes in New South Wales, Australia, and Chajnantor in Chile. A related discipline is Very-long-baseline interferometry (VLBI).

#### Highest astronomical observatories

Since the mid-20th century, a number of astronomical observatories have been constructed at very high altitudes, above 4,000–5,000 m (13,000–16,000 ft). The largest and most notable of these is the Mauna Kea Observatory, located near the summit of a 4,205 m (13,796 ft) volcano in Hawaiʻi. The Chacaltaya Astrophysical Observatory in Bolivia, at 5,230 m (17,160 ft), was the world's highest permanent astronomical observatory from the time of its construction during the 1940s until 2009. It has now been surpassed by the new University of Tokyo Atacama Observatory, an optical-infrared telescope on a remote 5,640 m (18,500 ft) mountaintop in the Atacama Desert of Chile.

#### Oldest astronomical observatories

The oldest proto-observatories, in the sense of an observation post for astronomy,
* Wurdi Youang, Australia
* Zorats Karer, Karahunj, Armenia
* Loughcrew, Ireland
* Newgrange, Ireland
* Stonehenge, Great Britain
* Chankillo, Peru
* El Caracol, Mexico
* Buto, Egypt
* Abu Simbel, Egypt
* Kokino, Kumanovo, North Macedonia
* Observatory at Rhodes, Greece
* Goseck circle, Germany
* Ujjain, India
* Arkaim, Russia
* Cheomseongdae, South Korea
* Angkor Wat, Cambodia
The oldest true observatories, in the sense of a specialized research institute, include:
* 825: Al-Shammisiyyah Observatory, Baghdad, Iraq
* 869: Mahodayapuram Observatory, Kerala, India
* 1259: Maragheh Observatory, Azerbaijan, Iran
* 1276: Gaocheng Astronomical Observatory, China
* 1420: Ulugh Beg Observatory, Samarqand, Uzbekistan
* 1442: Beijing Ancient Observatory, China
* 1577: Constantinople Observatory of Taqi ad-Din, Turkey
* 1580: Uraniborg, Denmark
* 1581: Stjerneborg, Denmark
* 1633: Leiden Observatory, Netherlands
* 1642: Panzano Observatory, Italy
* 1642: Round Tower, Denmark
* 1667: Paris Observatory, France
* 1675: Royal Greenwich Observatory, England
* 1695: Sukharev Tower, Russia
* 1711: Berlin Observatory, Germany
* 1724: Jantar Mantar, India
* 1753: Stockholm Observatory, Sweden
* 1753: Vilnius University Observatory, Lithuania
* 1753: Real Instituto y Observatorio de la Armada, Spain
* 1759: Trieste Observatory, Italy.
* 1757: Macfarlane Observatory, Scotland.
* 1759: Turin Observatory, Italy.
* 1764: Brera Astronomical Observatory, Italy.
* 1765: Mohr Observatory, Indonesia.
* 1771: Lviv Observatory, Ukraine.
* 1774: Observatory of the Vatican, Italy.
* 1785: Dunsink Observatory, Ireland.
* 1786: Madras Observatory, India.
* 1789: Armagh Observatory, Northern Ireland.
* 1790: Royal Observatory of Madrid, Spain,
* 1803: National Astronomical Observatory, Bogotá, Colombia.
* 1811: Tartu Old Observatory, Estonia
* 1812: Astronomical Observatory of Capodimonte, Naples, Italy
* 1830/1842: Depot of Charts & Instruments/US Naval Observatory, US
* 1830: Yale University Observatory Atheneum, US
* 1834: Helsinki University Observatory, Finland
* 1838: Hopkins Observatory, Williams College, US
* 1838: Loomis Observatory, Western Reserve Academy, US
* 1839: Pulkovo Observatory, Russia
* 1842: Cincinnati Observatory, US
* 1844: Georgetown University Astronomical Observatory, US
* 1847: Harvard College Observatory, US
* 1854: Detroit Observatory, US
* 1873: Quito Astronomical Observatory, Ecuador
* 1878: Lisbon Astronomical Observatory, Portugal
* 1884: McCormick Observatory, US
* 1888: Lick Observatory, US
* 1890: Smithsonian Astrophysical Observatory, US
* 1894: Lowell Observatory, US
* 1895: Theodor Jacobsen Observatory, US
* 1897: Yerkes Observatory, US
* 1899: Kodaikanal Solar Observatory, India

### Space-based observatories

Space-based observatories are telescopes or other instruments that are located in outer space, many in orbit around the Earth. Space telescopes can be used to observe astronomical objects at wavelengths of the electromagnetic spectrum that cannot penetrate the Earth's atmosphere and are thus impossible to observe using ground-based telescopes. The Earth's atmosphere is opaque to ultraviolet radiation, X-rays, and gamma rays and is partially opaque to infrared radiation so observations in these portions of the electromagnetic spectrum are best carried out from a location above the atmosphere of our planet. Another advantage of space-based telescopes is that, because of their location above the Earth's atmosphere, their images are free from the effects of atmospheric turbulence that plague ground-based observations. As a result, the angular resolution of space telescopes such as the Hubble Space Telescope is often much smaller than a ground-based telescope with a similar aperture. However, all these advantages do come with a price. Space telescopes are much more expensive to build than ground-based telescopes. Due to their location, space telescopes are also extremely difficult to maintain. The Hubble Space Telescope was able to be serviced by the Space Shuttles while many other space telescopes cannot be serviced at all.

### Airborne observatories

Airborne observatories have the advantage of height over ground installations, putting them above most of the Earth's atmosphere. They also have an advantage over space telescopes: The instruments can be deployed, repaired and updated much more quickly and inexpensively. The Kuiper Airborne Observatory and the Stratospheric Observatory for Infrared Astronomy use airplanes to observe in the infrared, which is absorbed by water vapor in the atmosphere. High-altitude balloons for X-ray astronomy have been used in a variety of countries.

### Neutrino observatories

Example underground, underwater or under ice neutrino observatories include:
* 1998–2003 Gallium Neutrino Observatory
* 1999–2006 Sudbury Neutrino Observatory
* 2003 Baikal Deep Underwater Neutrino Telescope
* 2010 IceCube Neutrino Observatory
* 2012 Helium and Lead Observatory (HALO)

## Meteorological observatories

Example meteorological observatories include:
* 1762 Kremsmünster Observatory, Austria
* 1781 Hohenpeißenberg Meteorological Observatory, Germany
* 1841 Colaba Observatory, India
* 1868 Kandilli Observatory, Türkiye
* 1869 New York Meteorological Observatory in Central Park, New York
* 1883 Hong Kong Observatory, Hong Kong
* 1885 Blue Hill Meteorological Observatory, Massachusetts
* 1932 Mount Washington Observatory, New Hampshire
* 1956 Mauna Loa Observatory, Hawaii