Tycho Brahe was a Danish nobleman, astronomer, and writer known for his accurate and comprehensive astronomical observations. He was born in the then-Danish peninsula of Scania. Tycho was 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". Most of his observations were more accurate than the best available observations at the time.
Tycho is a prominent lunar impact crater located in the southern lunar highlands, named after the Danish astronomer Tycho Brahe (1546–1601). It is estimated to be 108 million years old.
Christen Sørensen Longomontanus was a Danish astronomer.
Bessel is a small lunar impact crater that is located in the southern half of the Mare Serenitatis. The crater was named after the German astronomer Friedrich Wilhelm Bessel in 1935. Despite its small size, this is the largest crater to lie entirely within the mare. It lies to the north-northeast of the crater Menelaus.
Kepler is a lunar impact crater that lies between the Oceanus Procellarum to the west and Mare Insularum in the east. To the southeast is the crater Encke. Kepler is named for the 17th century German astronomer and mathematician Johannes Kepler.
Ball is a lunar impact crater that is located in the rugged southern highlands of the Moon. It was named after British astronomer William Ball. The formation is circular and symmetrical, and has received little significant wear. The interior is rough-surfaced, curving downward toward the relatively wide central peak at the midpoint.
Hell is a lunar crater in the south of the Moon's near side, within the western half of the enormous walled plain Deslandres. To the southeast, also within Deslandres, is the larger crater Lexell, and about 9° to the south lies the prominent Tycho crater. The crater received its name in 1935 after the Hungarian astronomer and ordained Jesuit priest Maximilian Hell. It has 19 satellite craters with diameters ranging between about 3 and 22 km. Nearly all Hell craters are relatively flat and shallow, with a sharp, well-defined rim and a typical diameter-to-depth ratio of about 10.
Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, all of which were formed by impacts. The International Astronomical Union currently recognizes 9,137 craters, of which 1,675 have been dated.
Montes Taurus is a rugged, jumbled mountainous region on the Moon. It is located to the east of the Mare Serenitatis, in the northeastern quadrant of the Moon's near side. Coordinates of their center are 27.32°N 40.34°E, and their extent is about 170 km.
The topography of the Moon has been measured by the methods of laser altimetry and stereo image analysis, including data obtained during the Clementine mission. The most visible topographic feature is the giant far side South Pole-Aitken basin, which possesses the lowest elevations of the Moon. The highest elevations are found just to the north-east of this basin, and it has been suggested that this area might represent thick ejecta deposits that were emplaced during an oblique South Pole-Aitken basin impact event. Other large impact basins, such as the maria Imbrium, Serenitatis, Crisium, Smythii, and Orientale, also possess regionally low elevations and elevated rims.
Wirtz is a crater on Mars, located in Argyre quadrangle at 48.6° south latitude and 26° west longitude. It measures approximately 120.26 kilometres (74.73 mi) in diameter and was named after Carl Wilhelm Wirtz, a German astronomer (1886–1956). The name was adopted by IAU's Working Group for Planetary System Nomenclature in 1973. Wirtz lies on the eastern edge of the large impact crater Argyre Planitia.
Dejnev is a crater on Mars, located in the Memnonia quadrangle at 25.1° south latitude and 164.8° west longitude. It was named after Russian geographer, explorer, and navigator Semyon Dezhnev (1605–1673). The name was adopted by IAU's Working Group for Planetary System Nomenclature in 1985.
Sagan is an impact crater on Mars, located in the Oxia Palus quadrangle at 10.8° N and 30.7° W. It measures approximately 90 kilometers in diameter and was named after American astronomer Carl Sagan, who founded the Planetary Society and is best known for the television series Cosmos. The naming was approved by IAU's Working Group for Planetary System Nomenclature in 2000.
Santa Maria is an impact crater on Mars, located at 2.172°S, 5.445°W within the Meridiani Planum extraterrestrial plain, lying situated within the Margaritifer Sinus quadrangle (MC-19) region.
Maggini is a large Martian impact crater in northwestern Arabia Terra, located in the Arabia quadrangle at 28.0° N and 350.6° W. It measures 143.0 kilometers in diameter and was named after Mentore Maggini. The name was approved by IAU's Working Group for Planetary System Nomenclature in 1973.
