The direction amongst the chord of an aeumlrocurve as well as the general course of this undisturbed atmosphere current
- the direction that a range makes with a range perpendicular to the surface during the point of incidence
Rigged angle regarding the wing or components of the wing in accordance with a datum point. (recreation: Hang gliding)
The determination of the curves of constant retardation depends upon expressing the retardation in terms of the optical constants of the crystal, the angle of incidence and the azimuth of the plane of incidence.