phase angle


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to phase angle: phase difference
Phase angles for superior and inferior planetclick for a larger image
Phase angles for superior and inferior planet

phase angle

The angle between the lines connecting the Moon and Sun and the Moon and Earth or connecting a planet and the Sun and the planet and Earth (see illustration). At full or new Moon the phase angle is 0° or 180°, respectively. At first and last quarters it is 90°. For the superior planets phase angle is greatest at quadrature. For the inferior planets it is greatest (180°) at inferior conjunction and equals 90° at greatest elongation.

phase angle

[′fāz ‚aŋ·gəl]
(physics)
The difference between the phase of a sinusoidally varying quantity and the phase of a second quantity which varies sinusoidally at the same frequency. Also known as phase difference.

phase angle

phase angle
phase angle
i. An angle between the sight lines to the sun and the earth measured at a remote location (e.g., other celestial bodies).
ii. The number of electrical degrees between the time an AC (alternating current) voltage passes through zero moving in the positive direction and the time the current passes through zero going in the same direction.
iii. The phase difference between two sets of periodic phenomena expressed in an angular measure.
References in periodicals archive ?
Figures 1 and 2 show the variation of the phase angle and G* with frequency at different temperatures for TPB and TLA respectively.
mag] is the measured magnitude for filter X, X(1, [alpha])' is the normalized magnitude at a solar phase angle [alpha] and B = 7[degrees], r and d are the Saturn-Earth and Saturn-Sun distances in astronomical units, k is the fraction of Saturn + rings that is illuminated by the Sun as seen from the Earth and k is computed from k = (1 + cos [alpha])/2.
If the power supply removes one of the stages without adjusting the phase angles of the remaining two stages, as shown in Figure 2b, the output ripple increases by 86 percent to 9.
The phase angle ([Theta]) means the phase difference between two current components.
After taking clearance from ethical committee, all the patients with raised prostate specific antigen (PSA) and abnormal digital rectal examination were assessed for phase angle preoperatively.
Phase angle control with conduction period starting from the zero degree extending anywhere towards the zero crossing at the next 180 degrees is known as extinction angle control [4].
Without normalization the phase plane portraits would be plotted in different quadrants (positive x quadrants for the shoulder and negative x quadrants for hip), resulting in altered phase angle calculations and incorrect relative phase values.
Phase angle of twin-engine parallel operation is changed within the range of 0[degrees] to 720[degrees].
The primary objective of this study was to evaluate the association of BIA-derived phase angle with tumor node metastasis (TNM) staging of carcinoma of the tongue.
In order to control the compensator circuit a phase angle between transistor current and voltage needs to be identified.
The resulting 1/3 volt at full range current mirrors the primary circuit wave shape with less than a 2-degree difference in the phase angle and overall linearity of better than 1 percent of the full scale output.
The solar phase angle (a) is measured from the Moon's center to the Sun's center at the observer's location.