query: occupation helisaeus roeslin
supports: The Black Forest is a large forested mountain range in the state of Baden-Württemberg in southwestern Germany. It is bounded by the Rhine valley to the west and south. Its highest peak is the Feldberg with an elevation of 1,493 metres (4,898 ft). The region is roughly oblong in shape with a length of and breadth of up to . Stuttgart ( Swabian: "Schduagert"), often nicknamed the ""Schwabenmetropole"" in reference to its location in the center of Swabia and the local dialect spoken by some natives, is the capital and largest city of the German state of Baden-Württemberg. It is located on the Neckar river in a fertile valley locally known as the "Stuttgarter Kessel" an hour from the Swabian Jura and the Black Forest. Stuttgart's name comes from the Old High German word ""Stuogarten"," or "stud farm"  a reference to the city's founding in 950 AD as a stud farm. Stuttgarts urban area has a population of 623,738, and a further making it the sixth largest city in Germany, 2.7 million people live in the citys administrative region, and another 5.3 million people in its metropolitan area, making it the fourth largest metropolitan area in Germany. The Swabian Jura (more rarely: ), sometimes also named Swabian Alps in English, is a low mountain range in Baden-Württemberg, Germany, extending from southwest to northeast and in width. It is named after the region of Swabia. A stud farm or stud in animal husbandry is an establishment for selective breeding of livestock. The word "stud" comes from the Old English "stod" meaning "herd of horses, place where horses are kept for breeding". Historically, documentation of the breedings that occur on a stud farm leads to the development of a stud book. Male animals made available for breeding to outside female animals are said to be "standing at stud", or at "stud service", referencing the relatively high probability that they are kept at a stud farm. Helisaeus Roeslin ( 17 January 1545 , Plieningen ( now part of Stuttgart ) -- 14 August 1616 , Buchsweiler was a German physician and astrologer who adopted a geoheliocentric model of the universe . He was one of five observers who concluded that the Great Comet of 1577 was located beyond the moon . His representation of the comet , described as `` an interesting , though crude , attempt , '' was among the earliest and was highly complex . Roeslin had known Johannes Kepler since their student days and was one of his correspondents . Roeslin placed more emphasis on astrological predictions than did Kepler , and though he respected Kepler as a mathematician , he rejected some of Kepler 's cosmological principles , including Copernican theory . Kepler criticized Roeslin 's predictions in his book De stella nova , on the comet of 1604 , and the two kept up their arguments in a series of pamphlets written as dialogues . Roeslin 's 1597 book De opere Dei creationis is regarded as one of the major works in the late 16th - century controversy over the formulation of a geoheliocentric world system . Robert Burton refers to Roeslin in his Anatomy of Melancholy . Roeslin was physician - in - ordinary to the count palatine of Veldenz and the count of Hanau - Lichtenberg in Buchsweiler in Alsace . He made a prediction that the world would end in 1654 based on the appearance of a new star in 1572 . The Neckar is a river in Germany, mainly flowing through the southwestern state of Baden-Württemberg, with a short section through Hesse. The Neckar is a major right tributary of the Rhine. Rising in the Black Forest near Villingen-Schwenningen in the "Schwenninger Moos" conservation area at a height of above sea level, it passes through Rottweil, Rottenburg am Neckar, Kilchberg, Tübingen, Wernau, Nürtingen, Plochingen, Esslingen, Stuttgart, Ludwigsburg, Marbach, Heilbronn and Heidelberg, before discharging into the Rhine at Mannheim, at above sea level.  The Great Comet of 1577 (official designation: C/1577 V1) was a comet that passed close to Earth during the year 1577 AD. It was viewed by people all over Europe, including the famous Danish astronomer Tycho Brahe and Turkish astronomer Taqi ad-Din. From his observations of the comet, Brahe was able to discover that comets and similar objects travel above the Earth's atmosphere. The best fit using JPL Horizons suggests that the comet is currently about 320 AU from the Sun (based on 24 of Brahe's observations spanning 74 days from 13 November 1577 to 26 January 1578). An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside of the scope of Earth. They look at stars, planets, moons, comets and galaxies, as well as many other celestial objects  either in observational astronomy, in analyzing the data or in theoretical astronomy. Examples of topics or fields astronomers work on include: planetary science, solar astronomy, the origin or evolution of stars, or the formation of galaxies. There are also related but distinct subjects like physical cosmology which studies the Universe as a whole. A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to evolve gasses, a process called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet. Comet nuclei range from a few hundred metres to tens of kilometres across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times the Earth's diameter, while the tail may stretch one astronomical unit. If sufficiently bright, a comet may be seen from the Earth without the aid of a telescope and may subtend an arc of 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures. Tycho Brahe, born Tyge Ottesen Brahe (14 December 154624 October 1601), was a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations. He was born in the then Danish peninsula of Scania. Well known in his lifetime as an astronomer, astrologer and alchemist, he has been described as "the first competent mind in modern astronomy to feel ardently the passion for exact empirical facts." His observations were some five times more accurate than the best available observations at the time.
candidates: acting astrologer astronomer book major mountain official scientist
answer: astronomer