angle

Alpha Librae (α Lib / α Librae) is the second brightest star in the constellation Libra (despite its Bayer designation as "alpha"). It also has the traditional name Zubenelgenubi. Alpha Librae is located approximately 77 light years from the Sun. It is actually a visual binary consisting of two stars separated in the sky by an angular distance of 231" (3'51"). The brighter of the two is a white star of spectral type A3, with an apparent brightness of 2.8 and an absolute brightness of 1.1, designated alpha-2 Librae (α< ...

Read more here: » Alpha Librae: Encyclopedia - Alpha Librae

In human and zoological anatomy (sometimes called zootomy), several terms are used to describe the location of organs and other structures in the body of bilateral animals. These terms are listed and explained here. In some cases, the terminology in human anatomy may differ from that in general anatomy. The anatomical position holds more relevant information on relations and terms of location for human anatomy. Anatomical terms of location - Directions. Anatomical terms of location - Ge ...

Including:

• Anatomical terms of location - Directions
• Anatomical terms of location - General usage
• Anatomical terms of location - Usage in human anatomy
• Anatomical terms of location - Relative directions
• Anatomical terms of location - Relative directions in the limbs
• Anatomical terms of location - Planes
• Anatomical terms of location - General usage
• Anatomical terms of location - Usage in human anatomy
• Anatomical terms of location - Relative motions

Read more here: » Anatomical terms of location: Encyclopedia - Anatomical terms of location

In astronomy and surveying, altitude (sometimes called elevation) is one of the two coordinates of the horizontal coordinate system, and refers to the vertical angle from the horizon. The other coordinate is azimuth, which refers to the horizontal angle from the north. The altitude, α, of a star is given by: where δ is the declination of the object, HA is its hour angle, and

Read more here: » Altitude astronomy: Encyclopedia - Altitude astronomy

Bisection is the general activity of dividing something into two parts. In geometry, the concept is limited to divisions into two equal parts, usually by a line, which is then called a bisector. The most often considered types of bisectors are segment bisectors and angle bisectors. An angle bisector divides the angle into two equal angles. An angle only has one bisector. Each point of an angle bisector is equidistant from the sides of the angle. The interior bisector of an angle is the line or line segment ...

Read more here: » Bisection: Encyclopedia - Bisection

Angular resolution describes the resolving power of a telescope. Angular resolution - Definition of terms. Resolving power is the ability of a microscope or telescope to measure the angular separation of images that are close together. Resolution is the minimum distance between distinguishable objects, in microscopy. These terms also apply to other angle and position measuring devices. Resolution, more generally, is the precision of any instrument to measure a continuous variable ...

Including:

• Angular resolution - Definition of terms
• Angular resolution - Explanation
• Angular resolution - Telescope case
• Angular resolution - Microscope case

Read more here: » Angular resolution: Encyclopedia - Angular resolution

Angle of attack (α, Greek letter alpha) is a term used in aerodynamics to describe the angle between the airfoil's chord line and the direction of airflow wind, effectively the direction in which the aircraft is currently moving. The amount of lift generated by a wing is directly related to the angle of attack, with greater angles generating more lift (and more drag as it increases the frontal area). This remains true up to the stall point, where lift starts to decrease again because of airflow separation ...

Including:

• Angle of attack - Sailing

Read more here: » Angle of attack: Encyclopedia - Angle of attack

The mathematical constant π is a real number which may be defined as the ratio of a circle's circumference (Greek περιφέρεια, periphery) to its diameter in Euclidean geometry, and which is in common use in mathematics, physics, and engineering. The name of the Greek letter π is pi (pronounced pie in English), and this spelling can be used in typographical contexts where the Greek letter is not available. π is also known as Archimedes' constant (not to be confused with Archime ...

Including:

• Pi - Properties
• Pi - Formulae involving π
• Pi - Geometry
• Pi - Analysis
• Pi - Continued fractions
• Pi - Number theory
• Pi - Dynamical systems and ergodic theory
• Pi - Physics
• Pi - Probability and statistics
• Pi - History of π
• Pi - Numerical approximations of π
• Pi - Miscellaneous formulae
• Pi - Less accurate approximations
• Pi - Open questions
• Pi - The nature of π
• Pi - Fictional references
• Pi - π culture

Read more here: » Pi: Encyclopedia - Pi

The vagina, (from the Latin for "sheath" or "scabbard" ) is the tubular tract leading from the uterus to the exterior of the body in female placental mammals and marsupials, or to the cloaca in female birds, monotremes, and some reptiles. Female insects and other invertebrates also have a vagina, which is the terminal part of the oviduct. Vagina - Human vagina. Vagina - Anatomy. The human vagina is an elastic muscular tube about 4 inches (100 mm) long and 1 inch (25 mm) in diame ...

Including:

• Vagina - Human vagina
• Vagina - Anatomy
• Vagina - Functions of the vagina
• Vagina - Sexual health and hygiene
• Vagina - The vagina and popular culture

Read more here: » Vagina: Encyclopedia - Vagina

Chinese language    General Chinese    Singapore Mandarin For Standard Mandarin     EFEO     Gwoyeu Romatzyh     Hanyu Pinyin     Latinxua Sinwenz     Lessing-Othmer     Mandarin Phonetic Symbols II     Postal System Pinyin     Tongyong Pinyin     Wade-Giles
Including:

• Pinyin - Pronunciation
• Pinyin - Initials
• Pinyin - Finals
• Pinyin - Rules given in terms of English pronunciation
• Pinyin - Pronunciation of initials
• Pinyin - Pronunciation of finals
• Pinyin - Orthographic features
• Pinyin - Tones
• Pinyin - Rules for placing the tone mark
• Pinyin - Miscellanea
• Pinyin - Pinyin in Taiwan
• Pinyin - Other languages
• Pinyin - Controversy
• Pinyin - Accessibility note

Read more here: » Pinyin: Encyclopedia - Pinyin

A mirror is a surface with good specular reflection that is smooth enough to form an image. The best known example is the plane mirror. The most common use is in the home for personal grooming but mirrors are also used in scientific apparatus such as telescopes and lasers, and in industrial machinery. Mirror - Effect. In a plane mirror, a parallel beam of light changes its direction as a whole, whilst still remaining parallel; the images formed by a plane mirror are virtual images, of the same size a ...

Including:

• Mirror - Effect
• Mirror - Image in a mirror
• Mirror - Composition
• Mirror - Applications
• Mirror - Viewing one's own body
• Mirror - Instruments
• Mirror - Safety and easier viewing
• Mirror - One-way mirror
• Mirror - Decoration
• Mirror - Signaling
• Mirror - Entertainment
• Mirror - Mirrors in literature

Read more here: » Mirror: Encyclopedia - Mirror

In mathematics, a spiral is a curve which turns around some central point or axis, getting progressively closer to or farther from it, depending on which way one follows the curve. Spiral - Two-dimensional spirals. A two-dimensional spiral may be described using polar coordinates by saying that the radius r is a continuous monotonic function of θ. The circle would be regarded as a degenerate case (the function not being strictly monotonic, but rather constant). Some of the more import ...

Including:

• Spiral - Two-dimensional spirals
• Spiral - Three-dimensional spirals
• Spiral - Spherical spiral

Read more here: » Spiral: Encyclopedia - Spiral

A triangle is one of the basic shapes of geometry: a two-dimensional figure with three vertices and three sides which are straight line segments. Triangle - Types of triangles. Triangles can be classified according to the relative lengths of their sides: In an equilateral triangle all sides are of equal length. An equilateral triangle is also equiangular, i.e. all its internal angles are equal—namely, 60°; it is a regular polygon In an isosceles triangle two sid ...

Including:

• Triangle - Types of triangles
• Triangle - Basic facts
• Triangle - Points lines and circles associated with a triangle
• Triangle - Computing the area of a triangle
• Triangle - Using geometry
• Triangle - Using vectors
• Triangle - Using trigonometry
• Triangle - Using coordinates
• Triangle - Using Heron's formula
• Triangle - Using the side lengths and a numerically stable formula
• Triangle - Non-planar triangles

Read more here: » Triangle: Encyclopedia - Triangle

An anomaly is a deviation from the common rule. It is an irregularity that is difficult to explain using existing rules or theory. Anomaly may also mean: Anomaly - In Science. In astronomy, the anomaly is the angular distance of a planet from its periapsis: The true anomaly is observed from the primary (I.e., from the orbit's focus); The eccentric anomaly is observed from the centre of the ellipse, using a projection of the planet's position onto the circumscrib ...

Including:

• Anomaly - In Science
• Anomaly - In Arts and Entertainment

Read more here: » Anomaly: Encyclopedia - Anomaly

Old Indian measures are still in use today, primarily for religious purposes in Hinduism and Jainism. They also are employed in the teachings of Surat Shabda Yoga. Hindu units of measurement - Time. The Hindu metrics of time (Kaala Vyavahara) can be summarized as below. Hindu units of measurement - Sidereal metrics. a paramanu is the normal interval of blinking in humans, or approximately 4 seconds a vighati is 6 paramaanus, or approxim ...

Including:

• Hindu units of measurement - Time
• Hindu units of measurement - Sidereal metrics
• Hindu units of measurement - Lunar metrics
• Hindu units of measurement - Tropical metrics
• Hindu units of measurement - Yugas

Read more here: » Hindu units of measurement: Encyclopedia - Hindu units of measurement

In astrology, an aspect is the relative angle between two heavenly bodies. These aspects are held to influence human affairs: the more exact the aspect is, the more important it is said to be. The difference between the exact aspect and the actual aspect is called the orb. As an example, if an astrologer creates a birth chart showing the apparent positions of the heavenly bodies at the times of a person's birth (a natal chart), and the apparent angle between Mars and Venus is 92°, the chart is said to have the aspect "Venus squ ...

Read more here: » Astrological aspect: Encyclopedia - Astrological aspect

Military vehicles are commonly armoured to withstand the impact of shrapnel, bullets or shells, protecting the soldiers inside from enemy fire. The design and purpose of the vehicle determines the amount of armour plating carried, as the plating is often very heavy and excessive amounts of armour restrict mobility. The most heavily armoured vehicles today are the main battle tanks, which are the spearhead of the ground forces, and are designed to withstand anti-tank missiles, kinetic energy penetrators, NBC threats and in some ...

Including:

• Vehicle armour - Technologies
• Vehicle armour - Spaced armour
• Vehicle armour - Composite armour
• Vehicle armour - Reactive armour
• Vehicle armour - Electrically charged armour

Read more here: » Vehicle armour: Encyclopedia - Vehicle armour

A vibration in a string is a wave. Usually a vibrating string produces a sound whose frequency is constant. Therefore, since frequency characterizes the pitch, the sound produced is a constant note. Vibrating strings are the basis of any string instrument like guitar, cello, or piano. Vibrating string - Speed of propagation of the wave. Let L be the length of the string, m its mass and T the tension.< ...

Including:

• Vibrating string - Speed of propagation of the wave
• Vibrating string - Frequency of the wave
• Vibrating string - Miscellaneous

Read more here: » Vibrating string: Encyclopedia - Vibrating string

In mathematics, a unit circle is a circle with unit radius, i.e., a circle whose radius is 1. Frequently, especially in trigonometry, "the" unit circle is the circle of radius 1 centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane. The unit circle is often denoted S1; the generalization to higher dimensions is the unit ball. If (x, y) is a point on the unit circle in the first quadrant, then x and y are the lengths of the legs of a right triangle whose hypotenuse has length 1. Thus, by the Pythagorean theorem, x and ...

Including:

• Unit circle - Trigonometric functions on the unit circle
• Unit circle - Circle group

Read more here: » Unit circle: Encyclopedia - Unit circle

In physics and in vector calculus, a spatial vector is a concept characterized by a magnitude, which is a scalar, and a direction (which can be defined in a 3-dimensional space by the Euler angles). Although it is often described by a number of "components", each of which is dependent upon the particular coordinate system being used, a vector is an object with properties which do not depend on the coordinate system used to describe it. ...

Including:

• Vector spatial - Definitions
• Vector spatial - Examples in one dimension
• Vector spatial - Generalizations
• Vector spatial - Representation of a vector
• Vector spatial - Length of a vector
• Vector spatial - Vector equality
• Vector spatial - Vector addition and subtraction
• Vector spatial - Scalar multiplication
• Vector spatial - Unit vector
• Vector spatial - Dot product
• Vector spatial - Cross product
• Vector spatial - Scalar triple product
• Vector spatial - Vectors as directional derivatives

Read more here: » Vector spatial: Encyclopedia - Vector spatial

Curve fitting is finding a curve which matches a series of data points and possibly other constraints. This section is an introduction to both interpolation (where an exact fit to constraints is expected) and curve fitting/regression analysis (where an approximate fit is permitted). Curve fitting - Fitting data points to lines and polynomial curves. Let's start with a first degree polynomial equation: This is a line with slope a (as opposed to the usual slope m for ...

Including:

• Curve fitting - Fitting data points to lines and polynomial curves
• Curve fitting - Fitting data points to other curves
• Curve fitting - Application to surfaces

Read more here: » Curve fitting: Encyclopedia - Curve fitting