|
Wilhelm Gotthelf Lohrmann
Wilhelm Gotthelf Lohrmann (31 January 1796 – 20 February 1840) was a Saxon cartographer, astronomer, meteorologist and patron of the sciences. He was born in Dresden, the son of a brickmaster. In 1810 he attended school at the ''Pfeilschmidtschen Garnisonsschule'', then studied architecture. His mother died in 1812, his father in 1817, and his first wife Christiane Amalie died in 1827. The couple had married in 1819, and she had borne six children. Wilhelm would marry again in 1828 to Henriette. In 1821 he made observations of the Moon, enabling him to produce a ''Mondkärtchen'' (lunar map). This map was further developed in 1824 as ''Topographie der sichtbaren Mondoberfläche'' ("Topography of the visible surface of the moon"), and the four sections are now stored as a historical work at the Technische Universität Dresden library. His maps were completed in 1836, but were not published before his death. In 1878, Johann Schmidt edited and published all 25 sections of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Gotthelf Lohrmann
Wilhelm Gotthelf Lohrmann (31 January 1796 – 20 February 1840) was a Saxon cartographer, astronomer, meteorologist and patron of the sciences. He was born in Dresden, the son of a brickmaster. In 1810 he attended school at the ''Pfeilschmidtschen Garnisonsschule'', then studied architecture. His mother died in 1812, his father in 1817, and his first wife Christiane Amalie died in 1827. The couple had married in 1819, and she had borne six children. Wilhelm would marry again in 1828 to Henriette. In 1821 he made observations of the Moon, enabling him to produce a ''Mondkärtchen'' (lunar map). This map was further developed in 1824 as ''Topographie der sichtbaren Mondoberfläche'' ("Topography of the visible surface of the moon"), and the four sections are now stored as a historical work at the Technische Universität Dresden library. His maps were completed in 1836, but were not published before his death. In 1878, Johann Schmidt edited and published all 25 sections of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Heinrich Schwabe
Samuel Heinrich Schwabe (25 October 1789 – 11 April 1875) a German astronomer remembered for his work on sunspots. Schwabe was born at Dessau. At first an apothecary, he turned his attention to astronomy, and in 1826 commenced his observations on sunspots. Schwabe was looking for a possible planet inside the orbit of Mercury. Because of the proximity to the Sun, it would have been very difficult to observe such a planet, and Schwabe believed one possibility to detect a new planet might be to see it as a dark spot when passing in front of the Sun. For 17 years, from 1826 to 1843, on every clear day, Schwabe would scan the Sun and record its spots trying to detect any new planet among them. He did not find any planet but noticed the regular variation in the number of sunspots and published his findings in a short article entitled "Solar Observations during 1843". In it he made the suggestion of a probable ten-year period (i.e. that at every tenth year the number of spots reac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientists From Dresden
A scientist is a person who conducts scientific research to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales (circa 624-545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. In modern times, many scientists have advanced degrees in an area of science and pursue careers in various sectors of the economy such as academia, industry, government, and nonprofit environments.'''' History The roles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19th-century German Astronomers
The 19th (nineteenth) century began on 1 January 1801 ( MDCCCI), and ended on 31 December 1900 ( MCM). The 19th century was the ninth century of the 2nd millennium. The 19th century was characterized by vast social upheaval. Slavery was abolished in much of Europe and the Americas. The First Industrial Revolution, though it began in the late 18th century, expanding beyond its British homeland for the first time during this century, particularly remaking the economies and societies of the Low Countries, the Rhineland, Northern Italy, and the Northeastern United States. A few decades later, the Second Industrial Revolution led to ever more massive urbanization and much higher levels of productivity, profit, and prosperity, a pattern that continued into the 20th century. The Islamic gunpowder empires fell into decline and European imperialism brought much of South Asia, Southeast Asia, and almost all of Africa under colonial rule. It was also marked by the collapse of the large ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lohrmann (crater)
Lohrmann is a small lunar impact crater that is located to the west of the Oceanus Procellarum, near the western limb of the Moon. It lies to the north of the dark-floored walled plain Grimaldi, and just to the south of the crater Hevelius. This crater is nearly circular, although it does not appear so from the Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ... due to foreshortening. It has a narrow inner wall at the north end and a somewhat eroded edge. The interior floor has some low hills and a small craterlet in the western half. The remainder of the floor is relatively featureless except for some tiny craters. Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Lohrmann. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4680 Lohrmann
__NOTOC__ Year 468 ( CDLXVIII) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Anthemius without colleague (or, less frequently, year 1221 ''Ab urbe condita''). The denomination 468 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Emperor Leo I assembles a massive naval expedition at Constantinople, which costs 64,000 pounds of gold (more than a year's revenue) and consists of over 1,100 ships carrying 100,000 men. It is the greatest fleet ever sent against the Vandals and brings Leo near to bankruptcy. * Emperor Anthemius sends a Roman expedition under command of Marcellinus. He expels the Vandals from Sicily and retakes Sardinia. The Eastern general Heraclius of Edessa lands with a force on the Libyan coast, east of Carthage, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asteroid
An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. Of the roughly one million known asteroids the greatest number are located between the orbits of Mars and Jupiter, approximately 2 to 4 AU from the Sun, in the main asteroid belt. Asteroids are generally classified to be of three types: C-type, M-type, and S-type. These were named after and are generally identified with carbonaceous, metallic, and silicaceous compositions, respectively. The size of asteroids varies greatly; the largest, Ceres, is almost across and qualifies as a dwarf planet. The total mass of all the asteroids combined is only 3% that of Earth's Moon. The majority of main belt asteroids follow slightly elliptical, stable orbits, revolving in the same direction as the Earth and taking from three to six years to comple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunspots
Sunspots are phenomena on the Sun's photosphere that appear as temporary spots that are darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity. Their number varies according to the approximately 11-year solar cycle. Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from to . Larger sunspots can be visible from Earth without the aid of a telescope. They may travel at relative speeds, or proper motions, of a few hundred meters per second when they first emerge. Indicating intense magnetic activity, sunspots accompany other active region phenomena such as coronal loops, prominences, and reconnection events. Most solar flares and corona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Libration
In lunar astronomy, libration is the wagging or wavering of the Moon perceived by Earth-bound observers and caused by changes in their perspective. It permits an observer to see slightly different hemispheres of the surface at different times. It is similar in both cause and effect to the changes in the Moon's apparent size due to changes in distance. It is caused by three mechanisms detailed below, two of which cause a relatively tiny physical libration via tidal forces exerted by the Earth. Such true librations are known as well for other moons with locked rotation. The quite different phenomenon of a trojan asteroid's movement has been called ''Trojan libration''; and ''Trojan libration point'' means Lagrangian point. Lunar libration The Moon keeps one hemisphere of itself facing the Earth, due to tidal locking. Therefore, the first view of the far side of the Moon was not possible until the Soviet probe Luna 3 reached the Moon on October 7, 1959, and further lunar exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saxony
Saxony (german: Sachsen ; Upper Saxon: ''Saggsn''; hsb, Sakska), officially the Free State of Saxony (german: Freistaat Sachsen, links=no ; Upper Saxon: ''Freischdaad Saggsn''; hsb, Swobodny stat Sakska, links=no), is a landlocked state of Germany, bordering the states of Brandenburg, Saxony-Anhalt, Thuringia, Bavaria, as well as the countries of Poland and the Czech Republic. Its capital is Dresden, and its largest city is Leipzig. Saxony is the tenth largest of Germany's sixteen states, with an area of , and the sixth most populous, with more than 4 million inhabitants. The term Saxony has been in use for more than a millennium. It was used for the medieval Duchy of Saxony, the Electorate of Saxony of the Holy Roman Empire, the Kingdom of Saxony, and twice for a republic. The first Free State of Saxony was established in 1918 as a constituent state of the Weimar Republic. After World War II, it was under Soviet occupation before it became part of the communist East Ger ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Friedrich Julius Schmidt
Johann Friedrich Julius Schmidt (25 October 1825 in Eutin, Germany – 7 February 1884 in Athens, Greece) was a German astronomer and geophysicist. He was the director of the National Observatory of Athens in Greece from 1858 to 1884. Julius Schmidt was tireless in his work, it was suggested by William Henry Pickering that he perhaps devoted more of his life than any other man to the study of the Moon. During his lifetime, he made some of the most complete lunar maps of the 19th century. According to his own analysis, he mapped no less than 32,856 craters, with Mädler mapping 7,735 and Lohrmann 7,177. Schmidt also mapped 348 lunar rilles. In six years, he made almost 57,000 micrometer settings to make 3050 height measurements. Biography Early life Schmidt was born in the town of Eutin to his father Carl Friedrich Schmidt, a glazier and mother Maria Elisabeth Quirling. He went to school at a gymnasium in Hamburg, where he impressed with his sense of form and drawing abiliti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_2007-04-30_T001456.gif "Click for more on -> Sunspots")
