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1An angle representing a difference in phase, 360 degrees (2π radians) corresponding to one complete cycle.

‘Quadrature Amplitude Modulation uses a combination of phase angles and amplitude to code digital information on an analog sine wave signal.’

‘Given that the field oscillates at 60Hz, this gives me a phase angle of 0.4PI radians between samples.’

‘Time-resolved anisotropy measurements are obtained from the frequency-dependent phase angle difference between the parallel and perpendicular components of the modulated fluorescence emission.’

‘The phase angle 8 defines the relative contributions of viscous and elastic resistances to particle motion and can be computed from the slope of Gd versus frequency.’

‘Experimental data in the frequency domain lifetime measurements are usually presented as increasing values of the frequency-dependent phase angle ([Phi]) and decreasing values of the modulation.’

1.1Astronomy The angle between the lines joining a given planet to the sun and to the earth.

‘In astronomy, many light curve measurements are done at near zero phase angles (in opposition) because the scattering surface area of the measured object is largest.’

‘The left image is from a phase angle of only 6 degrees, and Janus appears bright because nearly its entire visible surface is reflecting light.’

‘Ring structures containing these tiny particles brighten substantially at high phase angles: i.e., viewing angles where the Sun is almost directly behind the objects being imaged.’