 | This article relies largely or entirely on a single source .(March 2020) |
| Emission nebula | |
|---|---|
 A Hubble Space Telescope (HST) image of N 180B. | |
| Observation data: J2000 epoch | |
| Right ascension | 5h 48m 48.6s [1] |
| Declination | −70° 42′ 52″ [1] |
| Constellation | Dorado [1] |
| Designations | LMC N 180B, [1] LHA 120-N 180B [1] |
N 180B is an emission nebula located in the Large Magellanic Cloud.
In Euclidean geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in the plane that contains the rays. Angles are also formed by the intersection of two planes. These are called dihedral angles. Two intersecting curves may also define an angle, which is the angle of the rays lying tangent to the respective curves at their point of intersection.
Longitude is a geographic coordinate that specifies the east–west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ). Meridians are imaginary semicircular lines running from pole to pole that connect points with the same longitude. The prime meridian defines 0° longitude; by convention the International Reference Meridian for the Earth passes near the Royal Observatory in Greenwich, south-east London on the island of Great Britain. Positive longitudes are east of the prime meridian, and negative ones are west.
The radian, denoted by the symbol rad, is the unit of angle in the International System of Units (SI) and is the standard unit of angular measure used in many areas of mathematics. It is defined such that one radian is the angle subtended at the centre of a circle by an arc that is equal in length to the radius. The unit was formerly an SI supplementary unit and is currently an SI derived unit, expressed in terms of the SI base unit metre (m) as rad=m/m. Thus, the radian is defined in the SI as being a derived dimensionless unit, with 1 rad = 1. Its symbol is accordingly often omitted, especially in mathematical writing.
In statistics, stratified sampling is a method of sampling from a population which can be partitioned into subpopulations.
Angle trisection is a classical problem of straightedge and compass construction of ancient Greek mathematics. It concerns construction of an angle equal to one third of a given arbitrary angle, using only two tools: an unmarked straightedge and a compass.
In electrical engineering and control theory, a Bode plot is a graph of the frequency response of a system. It is usually a combination of a Bode magnitude plot, expressing the magnitude of the frequency response, and a Bode phase plot, expressing the phase shift.
A dihedral angle is the angle between two intersecting planes or half-planes. In chemistry, it is the clockwise angle between half-planes through two sets of three atoms, having two atoms in common. In solid geometry, it is defined as the union of a line and two half-planes that have this line as a common edge. In higher dimensions, a dihedral angle represents the angle between two hyperplanes. The planes of a flying machine are said to be at positive dihedral angle when both starboard and port main planes are upwardly inclined to the lateral axis. When downwardly inclined they are said to be at a negative dihedral angle.
180 is the natural number following 179 and preceding 181.
A central angle is an angle whose apex (vertex) is the center O of a circle and whose legs (sides) are radii intersecting the circle in two distinct points A and B. Central angles are subtended by an arc between those two points, and the arc length is the central angle of a circle of radius one. The central angle is also known as the arc's angular distance. The arc length spanned by a central angle on a sphere is called spherical distance.
The longitude of the ascending node is one of the orbital elements used to specify the orbit of an object in space. It is the angle from a specified reference direction, called the origin of longitude, to the direction of the ascending node, as measured in a specified reference plane. The ascending node is the point where the orbit of the object passes through the plane of reference, as seen in the adjacent image. Commonly used reference planes and origins of longitude include:
The M181 is a motorway that links the town of Scunthorpe, England, to the M180 motorway. A spur of the M180, the road is virtually straight through its entire 2-mile (3.2 km) length. It was opened in December 1978, at the same time as the section of M180 from junction 3 (A15) to the east side of the River Trent.
SHA-2 is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001. They are built using the Merkle–Damgård construction, from a one-way compression function itself built using the Davies–Meyer structure from a specialized block cipher.
The Panamint Valley is a long basin located east of the Argus and Slate ranges, and west of the Panamint Range in the northeastern reach of the Mojave Desert, in eastern California, United States.
Dedinka is a municipality and village in the Nové Zámky District in the Nitra Region of south-west Slovakia.
Hidabu Abote is one of the Aanaas in the Oromia of Ethiopia. Part of the Kaba Shewa Zone, Hidabu Abote is bordered on the south by Kuyu, on the west by Wara Jarso, on the north by the Jamma River which separates it from Dera, and on the east by Degem. The major town in Hidabu Abote is Ejere Notable high points include Mount Ileu.
Myopsocidae is a family of mouse-like barklice, belonging to the infraorder Psocetae of the order Psocodea. This family is closely related to Psocidae, with which it shares similar wing-venation, but from which it is distinguished by three-segmented tarsi.
Europium(III) oxide (Eu2O3), is a chemical compound of europium and oxygen. It is widely used as a red or blue phosphor in television sets and fluorescent lamps, and as an activator for yttrium-based phosphors. It is also an agent for the manufacture of fluorescent glass. Europium fluorescence is used in the anti-counterfeiting phosphors in Euro banknotes.
Jessup or Jessups Station is an unincorporated community in Florida Township, Parke County, in the U.S. state of Indiana.
Entremont is a 3.5-hectare (8.6-acre) archaeological site three kilometres from Aix-en-Provence at the extreme south of the Puyricard plateau. In antiquity, the oppidum at Entremont was the capital of the Celtic-Ligurian confederation of Salyes. It was settled between 180 and 170 B.C., somewhat later than the inhabitation of other oppida, such as Saint-Blaise. The site was abandoned when it was taken by the Romans in 123 B.C. and replaced by Aquae Sextiae, a new Roman city founded at the foot of the plateau. By 90 B.C., the former oppidum was completely uninhabited.
No licensed radio stations broadcast on AM frequency 180 kHz any longer. Turkish broadcaster TRT is reported to have used the frequency in the past. In the United States, this frequency falls within the 160-190 kHz LowFER band allowed by Part 15 of the Federal Communications Commission, and hobby stations are permitted to use this frequency.
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