In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can
Menzerath’s law, or Menzerath–Altmann law (named after Paul Menzerath and Gabriel Altmann), is a linguistic law according to which the increase of a
The G-measure is the geometric mean of Recall and Precision. Precision (also called positive predictive value) is the fraction of retrieved instances that
The beta angle is a measurement that is used most notably in spaceflight. The beta angle determines the percentage of time an object such as a spacecraft
In astrodynamics an orbit equation defines the path of orbiting body around central body relative to , without specifying position as a function of time.