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Sisson Rock
Sisson Rock ( bg, скала Сисън, skala Sisson, ) is the rock off the north coast of Livingston Island in the South Shetland Islands, Antarctica long in west-east direction and wide, and split in three. Its surface area is . The vicinity was visited by early 19th century sealers.L. IvanovGeneral Geography and History of Livingston Island.In: ''Bulgarian Antarctic Research: A Synthesis''. Eds. C. Pimpirev and N. Chipev. Sofia: St. Kliment Ohridski University Press, 2015. pp. 17–28 The feature is named after Jonathan Sisson (1690–1747), a British instrument maker who invented the modern theodolite; in association with other names in the area deriving from the early development or use of geodetic instruments and methods. Location Sisson Rock is located at ,Bulgarian Antarctic Gazetteer. Antarctic Place-names Commission wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctica
Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest continent, being about 40% larger than Europe, and has an area of . Most of Antarctica is covered by the Antarctic ice sheet, with an average thickness of . Antarctica is, on average, the coldest, driest, and windiest of the continents, and it has the highest average elevation. It is mainly a polar desert, with annual precipitation of over along the coast and far less inland. About 70% of the world's freshwater reserves are frozen in Antarctica, which, if melted, would raise global sea levels by almost . Antarctica holds the record for the lowest measured temperature on Earth, . The coastal regions can reach temperatures over in summer. Native species of animals include mites, nematodes, penguins, seals and tardigrades. Where vegetation o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Essex Point
Essex Point is a point at the northwest end of Byers Peninsula, Livingston Island in the South Shetland Islands, Antarctica. It forms the west side of the entrance to Barclay Bay and the northeast side of the entrance to Svishtov Cove, and is surmounted by Drong Hill. The feature is part of the Antarctic Specially Protected Area ''ASPA 126 Byers Peninsula'', situated in one of its restricted zones. Measure 4 (2016), ATCM XXXIX Final Report. Santiago, 2016 It was named by the (UK-APC) in 1958 after the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctic Place-names Commission
The Antarctic Place-names Commission was established by the Bulgarian Antarctic Institute in 1994, and since 2001 has been a body affiliated with the Ministry of Foreign Affairs of Bulgaria. The Commission approves Bulgarian place names in Antarctica, which are formally given by the President of the Republic according to the Bulgarian Constitution (Art. 98) and the established international practice. Bulgarian names in Antarctica Geographical names in Antarctica reflect the history and practice of Antarctic exploration. The nations involved in Antarctic research give new names to nameless geographical features for the purposes of orientation, logistics, and international scientific cooperation. As of 2021, there are some 20,091 named Antarctic geographical features, including 1,601 features with names given by Bulgaria.Bulgarian Antarctic Gazett ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Window Island
Window Island is a small ice-free island off the north coast of Ray Promontory in the northwest of Byers Peninsula, Livingston Island in the South Shetland Islands, Antarctica. The island has a surface area of L.L. IvanovAntarctica: Livingston Island and Greenwich, Robert, Snow and Smith Islands.Scale 1:120000 topographic map. Troyan: Manfred Wörner Foundation, 2009. and rises to . It was known to the early 19th century sealers operating on Byers Peninsula. The feature was charted and descriptively named by Captain George Powell in the British sealing vessel ''Dove'' which visited the South Shetlands in 1820–22. Location Window Island is located at which is east-northeast of Essex Point, northeast of Voyteh Point, northwest of Nedelya Point and southwest of Cape Shirreff (British mapping in 1822 and 1968, Chilean in 1971, Spanish in 1861 and 1992, and Bulgarian in 2005 and 2009). See also * Composite Antarctic Gazetteer * List of Antarctic islands south of 6 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geodesy
Geodesy ( ) is the Earth science of accurately measuring and understanding Earth's figure (geometric shape and size), orientation in space, and gravity. The field also incorporates studies of how these properties change over time and equivalent measurements for other planets (known as '' planetary geodesy''). Geodynamical phenomena, including crustal motion, tides and polar motion, can be studied by designing global and national control networks, applying space geodesy and terrestrial geodetic techniques and relying on datums and coordinate systems. The job title is geodesist or geodetic surveyor. History Definition The word geodesy comes from the Ancient Greek word ''geodaisia'' (literally, "division of Earth"). It is primarily concerned with positioning within the temporally varying gravitational field. Geodesy in the German-speaking world is divided into "higher geodesy" ( or ), which is concerned with measuring Earth on the global scale, and "practical geodes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Shetland Islands
The South Shetland Islands are a group of Antarctic islands with a total area of . They lie about north of the Antarctic Peninsula, and between southwest of the nearest point of the South Orkney Islands. By the Antarctic Treaty of 1959, the islands' sovereignty is neither recognized nor disputed by the signatories and they are free for use by any signatory for non-military purposes. The islands have been claimed by the United Kingdom since 1908 and as part of the British Antarctic Territory since 1962. They are also claimed by the governments of Chile (since 1940, as part of the Antártica Chilena province) and Argentina (since 1943, as part of Argentine Antarctica, Tierra del Fuego Province). Several countries maintain research stations on the islands. Most of them are situated on King George Island, benefitting from the airfield of the Chilean base Eduardo Frei. There are sixteen research stations in different parts of the islands, with Chilean stations being ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodolite
A theodolite () is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes. The traditional use has been for land surveying, but it is also used extensively for building and infrastructure construction, and some specialized applications such as meteorology and rocket launching. It consists of a moveable telescope mounted so it can rotate around horizontal and vertical axes and provide angular readouts. These indicate the orientation of the telescope, and are used to relate the first point sighted through the telescope to subsequent sightings of other points from the same theodolite position. These angles can be measured with accuracies down to microradians or seconds of arc. From these readings a plan can be drawn, or objects can be positioned in accordance with an existing plan. The modern theodolite has evolved into what is known as a total station where angles and distances are measured electronically, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jonathan Sisson
Jonathan Sisson (1690 – 1747) was a prominent English instrument maker, the inventor of the modern theodolite with a sighting telescope for surveying, and a leading maker of astronomical instruments. Career Jonathan Sisson was born in Lincolnshire around 1690. He was apprenticed to George Graham (1673–1751), then became independent in 1722. He remained an associate of Graham and of the instrument maker John Bird (1709–1776). All three were recommended by the Royal Society and received some funding from the state, which recognised the value of instruments both to the Royal Navy and to merchant ships. After striking out on his own in 1722 and opening a business in the Strand in London, Sisson gained a reputation for making highly accurate arcs and circles, and for the altazimuth theodolites that he made to his own design. He became a well-known maker of optical and mathematical instruments. In 1729 Sisson was appointed mathematical instrument maker to Frederick, Prince of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
