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**"Phase angle"****Related Terms:**Quadrature, Obliquity, Incidence angle, Obliquity of the ecliptic, Inclination, Angle of incidence, Tilt angle, Position angle, Plane of the ecliptic, Gegenschein, Orbital plane, Subtend, Sine, Opposition, Angle, Aspect, Angle, Astronomical twilight, Parhelion, Trigonometric functions, Terminator, Phase , Right angle, Elevation angle, Angular, Obtuse angle, Stellar parallax, Cosine, Major axis, Conjunction, Superior conjunction, Anomaly, Heliostat, Ellipticity, Radiant, Azimuth angle, Civil twilight, Nautical twilight, Orthogonal, Ellipse, Ecliptic, Obtuse triangle, Angle bisector, Acute angle, Aspects, Semi-major axis, Straight angle, Dihedral angle, Elongation

The angle expressing phase relation.

is the angle at any point of the sine wave of an AC power supply and varies between 0 to 360 deg. over a cycle.

The angle between the Sun, an object, and an observer. 0 degrees phase means the Sun is behind the observer.

The phase angle is the Sun-Target-Observer angle. A phase angle of zero indicates that the Sun is, in effect, shining over your shoulder so you see a fully-lit target (like a full Moon). A phase angle of 180 degrees indicates that you are looking back toward the Sun at the "dark side" of a target (like a new Moon). Bodies much larger than the wavelength of light tend to be brightest at low phase angles. However, fine dust is very efficient at forward-scattering light, so dust tends to be brightest at high phase angles. The manner in which a ring scatters light can tell us a great deal about its particle properties. Back to the .

The number of electrical degrees of lead or lag between the voltage and current waveforms in an ac circuit.

The angle between the wave source and the object it interacts. Example a phase angle of 180 degrees means that the two waves are heading towards each other head on.

Relationship between two wave forms having the same frequency. This describes the amount of offset (generally measured in degrees of a complete cycle) between corresponding parts of the two waves.

The angle of lead or lag between voltage and current in an AC type waveform.

the angle measured at the centre of an illuminated body between the light source and the observer.

This is the angle between the sun, the surface, and THEMIS at the time the picture was obtained.

The angle between the incident sunlight and the viewing direction when looking at an illuminated surface. Low phase angles result in relatively few shadows being cast by the surface relief.

The angle between a line from the Sun to the center of a body and a line from the spacecraft to the center of the same body.

angle at which the steady state input signal leads the output signal.

a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle

The angle obtained by multiplying the phase of a periodic function by 360 if the angle is to be expressed in degrees, by 2p if the angle is expressed in radians, or by 400 if the angle is expressed in grads.

The angle between the inlet and exhaust lobe of a camshaft and is measured in degrees. This is taken as the angle on the camshaft not in the engine and is often confused with lobe centres. Can also be called lobe separation angle.

For a solar system object besides the earth and sun, the angle between the earth and the sun (or the earth's elongation from the sun) as seen from that third object. The phase angle is given in ephemerides on IAU Circulars and Minor Planet Circulars is denoted by either of the lower-case Greek letters beta or phi.

The point on the sine wave at which a transient occurs. IEEE states that transients can occur at any phase angle. It is important to be able to see suppression device response to transients at varying phase angles.

Phase angle refers to the relation between two sine waves which do not pass through zero at the same time. Considering one full cycle to be 360 degrees, the phase angle expresses how far apart the two waves are in relation to each other in degrees.

The angle in which waves come to a body.

Angle measured in degrees usually between moon's centre and earth and sun

In phase-angle control, each SCR of the back-to-back pair is turned on for a variable portion of the half-cycle that it conducts. Power is regulated by advancing or delaying the point at which the SCR is turned ON within each half cycle. Light dimmers are an example of phase-angle control.

The angle from the sun to an object to an observer. I.e., an object's phase angle is the angular separation ( elongation) between the Sun and the Earth as would be observed from that object.

for two sinusoidal (sines or cosines) functions, the angle that one leads or lags the other

The angle between the Sun, target, and the Galileo spacecraft. Low-phase is a small angle between the Sun, target, and the spacecraft. A low phase angle provides high sun illumination, similar to taking a picture from a high altitude at noon (with the sun directly overhead). Such illumination emphasizes the brightness contrasts of light and dark areas. High-phase is a large angle between the Sun, target, and the spacecraft. A high phase angle provides low sun illumination, similar to taking a picture from a high altitude at sunset or sunrise. Such illumination emphasizes the topography of the terrain.

Phase difference between two or more waves, normally expressed in degrees.

The angle between the object, Sun and observer. A phase angle of 180 degrees means that the Sun and the object lie in opposite directions from the observer and therefore the whole of the sunlit side is visible. A phase angle of 0 degrees means that the Sun and object ar in the same direction, as seen by the observer thus the unlit side will be presented to the observer, rendering the object effectively invisible. A phase angle of 90 or 270 degrees means that half of the sunlit side will be visible to the observer so a half phase will be visible. Between 0 and 90 degrees, the phases are waxing crescents.Between 90 and 180 degrees, waxing gibbous, between 180 and 270 the phases are waning gibbous and greater than 270 degrees - waning crescent.

The phase angle of a point on a periodic wave is the distance between the point and a specified reference point, expressed using an angular measure. This angular measure is obtained by projecting a rotating vector onto the real axis of the complex plane.

Phase angle in astronomical observations is the angle between the light incident onto an observed object and the light reflected from the object. In the context of the astronomical observations this used to be the angle Sun-object-Earth.